I've been having this issue for ages. Sometimes the keyboard layout in FFXIV randomly changes. I'm assuming it's caused by me hitting some key combination but I have no clue what the combination is to revert it back. The only way I know of to revert it back to normal is restarting the client.

It's not the same one as used in Windows (shift+ctrl) and when the switch happens it affects FFXIV only. Does anyone have any clue what the key combination it is?