Hi,
It's caused by using custom overflow.
Please try to change CSS for the element <div class="website-wrapper" id="all_wrapper">
to:
overflow: hidden;
or overflow-x to default:
overflow-x:visible;
Another option is to use print media for the conversion.
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https://pdfcrowd.com/api/method-index/#html_to_pdf_set_use_print_media