I'm quite new to this. So yesterday I had put all my coins in a single wallet at 12:00 (matured at 14:00) - 570,000 coins total.
In about 8 hours after that I got a 35,000 reward. After 14 hours after that I got no reward and the stacking icon in the bottom says I will get my reward in 11 hours.
Why didn't I get 74,000 coins as reward equivalent to 5000% (13.4%) ??  Is this more or less random?