If you open your PDF in a text editor (Notepad, TextEdit, vi, etc) you will see that some CSS has been captured in the output stream. It wasn't obvious to me when looking briefly at the PHP where this was happening, but I would guess it's happening in a loop somewhere based on the repeating nature of the styling. Here's a sample:
<style>
body.main-body-style-dark #k2Container .latestItemDateCreated, body.main-body-style-dark #k2Container .latestItemCategory span, body.main-body-style-dark #k2Container .latestItemTagsBlock span, body.main-body-style-dark #k2Container .catItemDateCreated, body.main-body-style-dark #k2Container .catItemAuthor, body.main-body-style-dark #k2Container .catItemCategory span, body.main-body-style-dark #k2Container .catItemTagsBlock span, body.main-body-style-dark #k2Container .tagItemDateCreated, body.main-body-style-dark #k2Container .tagItemCategory span, body.main-body-style-dark #k2Container .userItemDateCreated, body.main-body-style-dark #k2Container .userItemCategory span, body.main-body-style-dark #k2Container .userItemTagsBlock span, body.main-body-style-dark #k2Container .itemDateCreated, body.main-body-style-dark #k2Container .itemAuthor, body.main-body-style-dark #k2Container .itemTextResizerTitle, body.main-body-style-dark #k2Container .itemRatingBlock, body.main-body-style-dark #k2Container .itemRatingBlock span, body.main-body-style-dark #k2Container .itemContentFooter, body.main-body-style-dark #k2Container .itemCategory span, body.main-body-style-dark #k2Container .itemTagsBlock span, body.main-body-style-dark #k2Container .genericItemHeader span, body.main-body-style-dark #k2Container .genericItemCategory span, body.main-body-style-dark #k2Container .latestItemsCategory h2 a, body.main-body-style-dark #k2Container .itemListCategory h2, body.main-body-style-dark #k2Container .itemListSubCategories .subCategory h2, body.main-body-style-dark #k2Container .itemListSubCategories .subCategory h2 a{ color : #000 !important; }
</style>
That's your first problem, and maybe if you fix it the PDF display issues will go away. But I did see a problem with the PDF content having been truncated. This truncation may be related, but it's hard to say until you address that issue.