No withdrawals have been made, the "withdrawals" you see are coins going into stake.
PoS works in the way that coins are sent "to the network into stake". They remain there for a certain amount of blocks and are then returned into your wallet for spending. So you'll see lots of "payouts" and therefore returning small blocks at the two pools addresses.
aha! most excellent

since almost nobody's turned on donations at the pools, i surely can't complain about a little PoS.
thanks again for your time, explanation, and hosting the pool ofc!