How is it possible that the blocks 558988 and 554683 have the same address for the farmer and the pool? If this happens it means that the block was won by a solo farmer and not by a pool implementing the official protocol, in that case the farmer and the pool addresses are different.
I’ve conducted a research about pools having this behaviour and trying to mask solo plots as pool plots: Suspicious pools. What is happening?.
This is a perfect example. Something is really wrong here.