UEFI boot entry regenerates with malformed path ‘File(.䍒)’ causing double GRUB menu

I have **Windows 10 pro and Ubuntu 24.04** installed on **HDD and SSD** respectively in **same** HP laptop. When booting I am getting 2 GRUB menu. First a blue + white screen, and later the normal ubuntu grub once I choose ubuntu. The boot order is set correctly. When I checked boot entries. I saw boot entry, > Boot0000* ubuntu HD(1,GPT,770c5016-f173-4ce9-84d6-0e067d606859,0x800,0x219800)/File(\EFI\ubuntu\shimx64.efi) File(.䍒) notice the File(.䍒) here! I deleted the boot entry and re-installed grub. Now I got the ubuntu grub first itself next time. However, after few days the old issue re-appeared. Now, when I checked - the same "File(.䍒)" was again found at end of boot entry. How to fix this? Another thing I noticed is that, during bootup there is a flash message 'Press F9 to change boot order' shown automatically although I don't do anything.