[Can't press confirm]

Hello. I don't know if this is a bug that only happens to me or maybe it's my mouse... Lately, while I'm playing I can't press CONFIRM on the screen, when the button don't have the Y key. This don't let me confirm the Master Hong's gift after getting a lvl up, confirm a trade between players, or delete a character.

Can it be fixed or after a while it comes back to normal? A friend of mine that plays with me also have the same problem...