Controller switch weapons

I dont know how to switch weapon sets with controller. It works sometimes but cant change it back. Need to go logins screen and switch to keyboard mode to undo it.

You can bind 'toggle weapon sets' in the button binding setup in the wheel menu. (I'm using a DS4 controller here, so the touchpad is what opens the character screens and holding opens the wheel menu.) Once bound, I have no issues using it.

edit: Also, there is an 'attack with weapon set 1' and 'attack with set 2' for normal melee attacks. If it feels like it's swapping randomly, this might be what you're doing. Not sure if there's a way to set it to normal attack with equipped weapon rather than the current setup.