Multiple ways to "fix" it. A memory wipe. Something stops them from using God ki such as maybe whis giving them the use of it to entertain Beerus. Earth not being much worth notice in a different universe compared to other tournament of power fighters and gt is set in those other universes just a few quick ideas and I don't do this for a living. So If I correctly they've already said it's in a alternate timeline but if they try to "fix" it it'll turn into starwars type issues. Biggest issue I see is gt Goku being healed by group of family didn't turn him into God mode. As for Beerus being in gt why would he need to be? Broly needs to be in gt? After freeza was beat Vegeta was off training to learn how to go super and Goku was missing I don't see a reason for broly to be around. Maybe he's the replacement to Beerus and is busy. These are so pointless now but these contradictions aren't. I don't think they watched it.