no idea how relevant they are today but 2 things that used to be quite commonly the cause for it would be. the "microsoft device associaition root enumerator" in device manager. many people found disabling that worked.


the second that comes to mind is steam. or more specifically "steam input" if enabled. This might only be for the steam client though unless you have a general controller profile set up in steam.

if your game is steam can go to your library find ffxiv right click > properties > controller > disable steam input.
my ffxiv isnt steam so i used tomb raider as an example

or if not the steam version but do have steam. open settings > controller > desktop configuration

and make sure everything is at its defaults. (ignore the ctrl+1-4 mappings I have applied to the rear paddles on my elite series 2)

maybe 1 of those will help