What is going in with blocks right now where a bunch of transcations show up with really high fees show up to populate the next block, but they are not evident in mempool in say the 2nd or 3rd block being constructed ? Anyone know ?
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the miner can include transactions in a block which are not known to the public
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Private life wakefields. 
Maybe they contain black listed utxos
Miners choose the transactions, and they will choose the ones that pay the most. It is normal for these transactions to immediately enter the next block. Or did I misunderstand your question?
No its probably the way i wrote it. Curious why the 2nd or 3rd block being constructed dont have any 100 plus sat/byte but then as soon as the block is mined, the next one fills up with 100 plus sat / byte transactions that were not present in the mempool as far as i can tell. Id imagine there would be some higher sat/ byte transactions in the 2nd, 3rd block being constructed too ( obviously less but still some ).
That's just because the transactions that pay really high fees push the ones that don't from the current next block. If there were enough degens out ther paying crazy high fees, their transactions would fit several "in construction" blocks, as you expect. There isn't just a full block of "really high fee" paying transactions in the mempool (yet?).
You can watch the mesmerising ballet of lower fee rates transactions getting pushed off the current next block in the detailed view of the block.