Apparent repetitive output of code with tabber

Not sure if this is a bug or mmy ignorance!

Issue: Massive output of code when using tabber tabs in product description

I was checking underlying code for a product screen that included tabs when I noticed that the code when printed to PDF ran to 104 pages!

The code included HTML tables within tabs and I thought this might be the issue. So I removed the tables and used image alignment tags instead (better idea!) but when I printed to PDF again, the code still ran to 94 pages!

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Here is the URL I am referring to:

chic.wynchcote.net/index.php/bedroom-fur...elie-double-wardrobe

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It would appear that the tabs output is being produced more than once!

I checked another URL where there are only paragraphs in tabs, and the underlying code ran only to 30 pages.

URL for comparison:

chic.wynchcote.net/index.php/bedroom-fur...elie-single-wardrobe


Is it normal for sets of tabs to be produced several times in the code but appearing on the screen only once?

Thanks for taking a look, Ken