Thanks. Strangely enough, the Blockchair website is not reachable from some of networks that I connect to.
You can use the explorer with Tor and honestly I am really unsure what is your network issue to connect to it and use it smoothly.
Could you share more what problems you got, with what browser. Someone can help you if there is solution.
The other blocks on the list seem to be blocks that included many Ordinal BTC-20 related TXs, especially those from September 2023: Block 806264 for example had 91,8% of TXs being Ordinal related, block 806249 84,8%, block 806280 91,6%, and so forth.
More than 80% to over 90% of a block capacity is too much.
Ordinals become more annoying since February 2023 and in last two months of 2023, they caused more issues for Bitcoin mempools and non-Ordinal Bitcoin users.
This is much higher than 50% like they contributed in February 2023.
Bitcoin block space