Inconsistent results in accessibility checker

You have four Tables (<Table>)elements/tags in the structure tree that lack the required <TableHead> child element.
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It is to a PDF at an acrobat.com account. Two tables are present in the Tagged PDF.
The first table is well-formed. The second is not. Open the Tags panel, expand the structure tree. Compare the two. You want table structure to be what is depicted by the first table.
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https://acrobat.com/#d=ERnEo4eifELVRRukAPH5kA
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Thanks- I'm aware of what the error message suggests. Read closely- I checked every table twice, they are all properly tagged.

The issue is that the accessibility checker passes with no problem if I check any range of pages EXCEPT all.

106 page document: check all pages, get 4 errors

check pages 1-51 no errors
check 50-106 no errors
check x - x no errors
check all: 4 errors

Not consistent

Curious - what did you do to get Acrobat's Full Checker to process just 1-51 and 50-106?

Acrobat X pro, tools > accessibility > Full checkThere is a Page Range choice- I use it all the time to pinpoint errors in a large document (as you probably know, often the links that show in the accesibility report don't always move you to the offending itemm in the document).

Thanks