Only 16 ttyUSB devices created for 32-port USB to RS-232 device

I recently purchased a Coolgear USB-32COM-RM 32 Port RS-232 USB-to-Serial Adapter connected to a Thinkpad T490s running Mint 21.3. Some lsusb output:

# lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 04f2:b681 Chicony Electronics Co., Ltd ThinkPad T490 Webcam
Bus 001 Device 118: ID 0403:6011 Future Technology Devices International, Ltd FT4232H Quad HS USB-UART/FIFO IC
Bus 001 Device 117: ID 0403:6011 Future Technology Devices International, Ltd FT4232H Quad HS USB-UART/FIFO IC
Bus 001 Device 116: ID 0403:6011 Future Technology Devices International, Ltd FT4232H Quad HS USB-UART/FIFO IC
Bus 001 Device 115: ID 0403:6011 Future Technology Devices International, Ltd FT4232H Quad HS USB-UART/FIFO IC
Bus 001 Device 114: ID 05e3:0610 Genesys Logic, Inc. Hub
Bus 001 Device 113: ID 05e3:0610 Genesys Logic, Inc. Hub
Bus 001 Device 109: ID 2109:8887 VIA Labs, Inc. 40AN
Bus 001 Device 108: ID 045e:0047 Microsoft Corp. IntelliMouse Explorer 3.0
Bus 001 Device 112: ID 17ef:3083 Lenovo ThinkPad Thunderbolt 3 Dock USB Audio
Bus 001 Device 110: ID 17ef:3081 Lenovo USB2.0 HUB
Bus 001 Device 107: ID 17ef:3080 Lenovo USB2.0 Hub             
Bus 001 Device 106: ID 17ef:3080 Lenovo USB2.0 Hub             
Bus 001 Device 003: ID 8087:0aaa Intel Corp. Bluetooth 9460/9560 Jefferson Peak (JfP)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

# lsusb -t
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 10000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 10000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
    |__ Port 2: Dev 106, If 0, Class=Hub, Driver=hub/5p, 480M
        |__ Port 1: Dev 107, If 0, Class=Hub, Driver=hub/4p, 480M
            |__ Port 1: Dev 110, If 0, Class=Hub, Driver=hub/2p, 480M
                |__ Port 2: Dev 112, If 2, Class=Audio, Driver=snd-usb-audio, 12M
                |__ Port 2: Dev 112, If 0, Class=Audio, Driver=snd-usb-audio, 12M
                |__ Port 2: Dev 112, If 3, Class=Human Interface Device, Driver=usbhid, 12M
                |__ Port 2: Dev 112, If 1, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 4: Dev 108, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 5: Dev 109, If 0, Class=, Driver=, 480M
    |__ Port 4: Dev 113, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 2: Dev 114, If 0, Class=Hub, Driver=hub/4p, 480M
            |__ Port 3: Dev 117, If 2, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 3: Dev 117, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 3: Dev 117, If 3, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 3: Dev 117, If 1, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 1: Dev 115, If 3, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 1: Dev 115, If 1, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 1: Dev 115, If 2, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 1: Dev 115, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 4: Dev 118, If 3, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 4: Dev 118, If 1, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 4: Dev 118, If 2, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 4: Dev 118, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 2: Dev 116, If 2, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 2: Dev 116, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 2: Dev 116, If 3, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
            |__ Port 2: Dev 116, If 1, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
    |__ Port 8: Dev 2, If 3, Class=Video, Driver=uvcvideo, 480M
    |__ Port 8: Dev 2, If 1, Class=Video, Driver=uvcvideo, 480M
    |__ Port 8: Dev 2, If 2, Class=Video, Driver=uvcvideo, 480M
    |__ Port 8: Dev 2, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 10: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
    |__ Port 10: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M

Even though this is a 32-port device, I only see 16 /dev/ttyUSB devices:

# ls -ld /dev/ttyUSB*
crw-rw---- 1 root dialout 188,  0 Dec 12 23:02 /dev/ttyUSB0
crw-rw---- 1 root dialout 188,  1 Dec 12 23:02 /dev/ttyUSB1
crw-rw---- 1 root dialout 188, 10 Dec 12 23:02 /dev/ttyUSB10
crw-rw---- 1 root dialout 188, 11 Dec 12 23:02 /dev/ttyUSB11
crw-rw---- 1 root dialout 188, 12 Dec 12 23:02 /dev/ttyUSB12
crw-rw---- 1 root dialout 188, 13 Dec 12 23:02 /dev/ttyUSB13
crw-rw---- 1 root dialout 188, 14 Dec 12 23:02 /dev/ttyUSB14
crw-rw---- 1 root dialout 188, 15 Dec 12 23:02 /dev/ttyUSB15
crw-rw---- 1 root dialout 188,  2 Dec 12 23:02 /dev/ttyUSB2
crw-rw---- 1 root dialout 188,  3 Dec 12 23:02 /dev/ttyUSB3
crw-rw---- 1 root dialout 188,  4 Dec 12 23:02 /dev/ttyUSB4
crw-rw---- 1 root dialout 188,  5 Dec 12 23:02 /dev/ttyUSB5
crw-rw---- 1 root dialout 188,  6 Dec 12 23:02 /dev/ttyUSB6
crw-rw---- 1 root dialout 188,  7 Dec 12 23:02 /dev/ttyUSB7
crw-rw---- 1 root dialout 188,  8 Dec 12 23:02 /dev/ttyUSB8
crw-rw---- 1 root dialout 188,  9 Dec 12 23:02 /dev/ttyUSB9

Why do I only see 16 of the 32 ports? Update: I removed the case. Looks like the bottom 16 ports are working but not the top 16. I swapped one of the cables from a lower board to the top board and the front lights appeared on the top board rather than the lower board so I might just need to replace the cable. These look like USB cables but the connectors are different. The writing on the cable is "AWM 2725 80C 30V VW-1 E237114 USB(28AWGX1P+28AWGX2C) CABLETECH TECHNOLOGY". Anyone know where I can purchase these USB cables. I reached out to Coolgear as well and am waiting to hear back.