What you were expecting to happen, and what actually happened:
In Dungeon I used Despond that summons Abject of Despond, but instead of summoning troop to my team It summoned it to enemy team.
How often does this happen? When did it begin happening?
It happend just once. But I didnt play this team often this evening.
To get this down correctly, Abject of Despond got placed on a screen location in the enemy team, it was still under your control, right? Troop art and frame are rendered as if belonging to your team, so this is likely a visual bug, not a battle logic bug.