Beach builder

I’ve been playing this game for a long time. It’s good, I enjoy it and like building type games. But there can always be use for improvements. My main issue is when building up my total capacity in storage capacity of materials. I’ll get to a certain max capacity and game take away the capacity the next time I go into the game. For example I’ll build my storage capacity to 325 play the game several times then at random I go to play and my storage capacity has dropped to 315, 305, and 295. There’s no way to get the capacity back except for earning materials to increase the capacity again. That