According to your game you can only get 50K of resources from a base per week. However I have found that if I raid a base on say Tuesday and wait until the next Tuesday to raid it again I will not get the full amount of resources that I am entitled to. Even though it has been a week since I last raided that base I will only get the difference between what I got last week and 50K. I have had this happen to me on numerous occasions.