Currently there's a hoard of scammers on discord, the ones that start the conversation with "hi sir".. Offering a fix to the apples and ask for 120$ "because it seems to be very difficult and time consuming to fix" so if anybody sees scum like this , make sure you block / avoid him.
This is the issue and according to github https://github.com/rathena/rathena/pull/2494#issuecomment-673528469
It's related to the 2020 client using "32 bits" and with the current release of the refine ui its at 16 bits.
So if anybody knows a fix to this and is willing to share it, i would really appreciate it!