So I noticed this extremely odd problem that I have never ever encountered before in my whole life. The problem is that while playing FFXIV and using my internet browser ( Chrome / Firefox) I keep having every single letter i type multiplied. LLiikkee tthhiiss.

Obviously this is really annoying and I have tried both chrome and firefox and the problem ends as soon as I exit the game.

Does anyone else have a problem like this and more importantly maybe a solution as well? I find it hard to play when I can't tab out and do some browsing or write some texts.
I have tried both windowed mode and fullscreen but the problem exists in both modes.