Hello Sween,
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?You are using CSS3 features on your pages. These are not supported by original Pdfcrowd API. I'd recommend you to switch your implementation to the new generation API.
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https://pdfcrowd.com/api/?I tried your page with the following command and it looks nice:
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$ curl -v -o /tmp/nummeroservices.pdf -u "your-user-name:your-api-key" -F url=http://nummeroservices.com/RenO1/ -F javascript_delay=5000 http://api.pdfcrowd.com/convert
/
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?I used javascript_delay option but you can optimize it by using wait_for_element_id option.
?Please see details in our documentation according your preferable programming language.
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https://pdfcrowd.com/api/#documentation?