In same species wars soldiers refuse to capture enemy cities, they just go in, kill all the soldiers and leave. Even when they go over seas they do the same thing and just sail off. This never used to happen before the game moved to steam. Does anyone know how to fix this?

I play on mobile and I've noticed that the people go to the land, get stuck, then run away or just sit there. I think it's a bug considering it's across mutiple platforms.