Thank you so much for playing!
This was kinda a redemption comeback for me hahaha, I felt so bad after realizing a couple streamers weren't allowed to play last time due to the game being unannounced!
I haven't watched the stream yet, but if the bug you're reporting is what I think it is, that would actually be a weird quirk of the fact that the game accepts mouse inputs as well as controller and keyboard (if your mouse happens to be hovering over a party member, the targeting constantly snaps back to that character, preventing you from targeting anyone else!)
I did add a feature to disable mouse inputs in the settings, but I think I'll probably need to take more drastic steps to prevent this since it is a relatively common issue people experience. Thanks a bunch for the feedback!