Probably because of the HTML Strict tag which appearantly sees:
<!---1e AD TABLE---->
ad table code
<!---1e AD TABLE end---->
as one big comment (hence <!-- from the first tag and --> from the last tag combined). You really have to follow the "rules" if you plan to work with the Strict tags. You could also insert a "Standard" tag which gives you more breathing space, but I'd fix those faulty comment tags first.
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