PvP Defense Broken on Mobile

Something is really wrong with the PvP defense resetting itself for no good reason, I started with team #1 for a while then levelled team #2 which got set for a while but then went back to team #1. Now every time I check the defense team it always goes back to team #2 who always lose because i’m not levelling them anymore.

I have this game on the XBox One and have done for maybe 2 years, I brought up this topic here and got no conclusive resolution to this problem. I got a new phone last week and downloaded this game but decided to play a fresh game, i’m shocked this is still a problem and the devs haven’t bothered to do anything about it.

Can anyone offer a fix which doesn’t rely on me changing my teams every time this stupid bug occurs?