I was using the Power Sword and when I loaded up my game again, the ability icon displayed the Bubble Shield, even if I still had the Power Sword equipped. Re-choosing the Power Sword fixed it though, but it’s a weird bug.
Also, when I first upgraded my Firestorm to use the Gastank upgrade (create a massive fire explosion), the alt fire did nothing but create a tiny burst animation. It still consumed ammo though but the effect only came into play after I died once. Weird.