What you were expecting to happen, and what actually happened:
Doing a World Event battle with Wyrmrun troops on the enemy side. I was expecting a normal board, what actually happened is messed up board after one turn.
I can still continue playing after this though
How often does this happen? When did it begin happening?
Maybe this is related to the troops that create gems at the start of battle.It has previously been reported that their are issues if you cast or move gems too quickly at the start of your turn when using troops that create gems at the start of your turn. I notice your first troop appears to be water weird which has the second trait born of water. This creates a blue gem at the start of your turn. Casting or making gem matches before the gem fully forms and resolves any matches has been show to cause errors. https://gemsofwar.zendesk.com/hc/en-us/articles/4409708259471-Hawthorn-Born-of-X-Trait-freezes-the-game