Rsync repeated copying with --checksum keeps finding differences

When I use the command rsync -avhc "/mnt/remotes/remote_disk_dir/" "/mnt/user/local_disk_dir" repeatedly, rsync seemingly keeps finding differences based on the checksum and therefore overwrites a few files. Normally if no differences are found, the output would be something like: sending incremental file list sent 23 bytes received 130 bytes 2.67M bytes/sec total size is 61.88G speedup is 75.66 I keep getting outputs like this: sending incremental file list file1.mp4 file7.mp4 file45.mp4 file68.mp4 sent 1.64G bytes received 73 bytes 2.62M bytes/sec total size is 61.88G speedup is 31.94 It is *not* the same files that is overwritten each time. The total size is about 60 GB with individual file sizes either around 10 MB or 500 MB. I have run the command 10 times and it still happens. I run the command from the terminal in Unraid 6.12.13 and the remote share is on a Windows 10 machine. Why does this happen? I am a complete beginner when it comes to Linux and command line.