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On my tests, I cloned your form and share it on the Facebook. As a result of this steps, I didn't replicate the same result with you. Please, see it from the below:
Please, check the steps you have applied to share your form on Facebook with the guide from the below:
After trying to add it again, please let us know the results.
Hi! I don't have any facebok page. Just wanna share it on my account but then I can't able to share it.
It looks like a false positive from Facebook end. I've tried sharing the form on my Facebook timeline and was able to share it without any issue.
Also, please complete the captcha/security check and the form should be shared fine. Please make sure that you are using the secured URL to your JotForm.
Please let us know if you need any further assistance. We will be happy to help.