hello, my wallet last mint time was on 30 may and it's fully synced with almost 2 billion sprts... what's the deal?
There is a limit in the minting that won't allow minting to happen if your chunk is 2 billion or more sprouts... so yeah, you have been wasting time.
The solution is to move those coins to separate addresses, in maybe 500 million, or 1 billion chunks, that's up to you. So long as 2 billion or more is not sitting on one address.