AT&T Fusion 2 switching around ringtones when changing battery

Here's my embarrassing backstory:
About 3 weeks after I got my new phone, I had it in my back pocket and it fell in the toilet. It was only in there for about 2 seconds but it got water into the battery cavity despite having a case on it. I dried it out but the battery wouldn't charge through the phone. So I bought a new battery and a wall charger to cover all bases. I am able to charge both my batteries on the wall (thank goodness!) but they don't last nearly as long as before. I could buy a new phone if I wanted, but I'd rather save the money right now.

Now I'm having this problem that when I switch out my batteries or just take out and replace the battery if my phone freezes or something, the phone switches my ringtones and alert tones around!

Anyone else have this issue, water-damaged phone or not?