Test on Nostr: I've been staring at next block info on mempool for an hour or so, particularly ...

I've been staring at next block info on mempool for an hour or so, particularly regarding fee distributions.

Seems to my untrained eye that as soon as a block is mined, a load of overpaying transactions immediately arrive for the following block.

Could some software have a faulty fee rate estimation, or is something trying to game fee rate estimation? Or more likely am I misinterpreting https://mempool.space/mempool-block/0 ?

Hoping an expert can explain this to a simple egg.