If you have example 175 total successful rounds finished and you click on rewards on the upper right corner you see 10, 20, 30, 40, and 50 total rounds rewards.
And it says now that you got only to 20 ? Shall you not have received total of 50+ rewards ?
You received the reward for 50 rounds at 150. Then it rested and you get reward at 160, 170 etc and then reward for 50 rounds at 200...
Cool, now i understand.