I think this bug started form this patch (I don't remember)
Played on PC Client
Happened in every battle, not only norman
I use controller for battle, the lock-on is LB+RB. when using controller to lock-on, it seems like it registered double, so I can't select other enemy. But when using in-game UI, it's fine.
I already tried changing the location of ingame UI, changing the button, and it's still the same.
Also, no overlapping button, and no problem with my controller either.