Is it normal that ALL of my coin age resets to 0 after I receive a minting reward?
I just waited out the 20 days while staking my 50,000 mint on a running wallet (I know it doesn't need to stay running but it was mostly up the whole time).

Then I saw two rewards come into the wallet that were "Generated but not accepted" (148 then 149 mint).
Finally I got a successful minting reward of 153 mint confirmed.
And now I'm no longer minting... "Not minting because you don't have mature coins"...

Umm, what?  This doesn't make any sense at all.   20 days to wait AGAIN, in between every staking reward?
If this is how it works then it's a total waste of my time.  This must be a bug in the wallet?
   https://imgur.com/a/SB8JF