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I have checked your forms from here, and they are loading correctly:
From the error you have posted, the blocking is being performed by the DNS provider you are using, or by your antivirus/antimalware software. As this blocking is done by a third-party, we have no control over what your security provider or DNS provider are blocking.
Please make sure to whitelist form.jotformeu.com domain in your security software.
If the issue persists even after whitelisting us in your security software, then I would suggest using another DNS provider - such as the most popular choices Google DNS or Open DNS, neither of which are blocking access to our domains:
Please let us know if there is anything else we can do to help from our end.