Problems with ad Inserter

If use PHP 8.0 then theres no “change settings” button and i cant do anything with Ad inserter.
If use PHP 7.4 then in 90% of the time when i click on the “change settings” button my webpage completely freezes(i cant click on anything)i get that message:”Incorrect data received – Ad Inserter settings are not saved”.

Missing settings for block 4: block-parameters-4
Missing settings for block 5: block-parameters-5
Missing settings for block 6: block-parameters-6
Missing settings for block 7: block-parameters-7
Missing settings for block 8: block-parameters-8
Missing settings for block 9: block-parameters-9
Missing settings for block 10: block-parameters-10
Missing settings for block 11: block-parameters-11
Missing settings for block 12: block-parameters-12
Missing settings for block 13: block-parameters-13
Missing settings for block 14: block-parameters-14
Missing settings for block 15: block-parameters-15
Missing settings for block 16: block-parameters-16`

The page I need help with: [log in to see the link]