[Snake]

That happens often when someone enters combat when another used Momentum. I.E, I join a guy who did move for 3M, and has 4M left. And also whenever you join a fight but the spawn positions are occupied.

The game drools a bit to process who's turn is what.

I think you can fix one of the two by making the joining players spawn on the border of the combat map, like Black Beasts do when they come in as reinforcements.