In only about one out of 10 attacks will my mineral storage actually fill to 5 mil. Most of the time it'll be exactly 500 minerals short as if it's taking the price of the PVP search out of the storage after the battle is finished. 500 isn't a lot but it's really annoying because it makes it hard to buy things from the shop for 5 mil. I've seen at least one other person have this problem. Has been persisting for at least a month since I maxed my mineral storage
Yes I made sure not to use the reload button. Yes I tried restarting the game. Here are some screenshots in chronological order