I was playing for last 2 weeks venture "Unknown Regions". I experienced some bugs during this time.
1. Returning to home-island generals without any troops, upon arrival, were duplicating in their tents troops, which these generals previously unloaded in adventure.
2. Unfinished weekly challenge, which I was leaving be on purpose, after login, were suddenly showing up as completed through gem purchase. Despite, I never clicked anything to pay any gems for their completion. I didn't notice any gems spent for their purchase either, but I could be wrong on this point.