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The "Create PDF" tool is still being improved, sometimes if the form is too long it might take time before it is fully converted. I cloned your form and tried to convert it and was able to do so.
If you can't convert the current form you have, you could try cloning it and see if the cloned form converts successfully to a fillable PDF.
Here's a guide on how to clone your form: https://www.jotform.com/help/27-How-to-clone-an-existing-form-from-your-account
I also strongly advise checking this link to learn more about our fillable PDF forms: https://www.jotform.com/help/312-Fillable-PDF-Everything-you-need-to-know-about-JotForm-Fillable-PDF-Creator
Let us know if the cloned form works. Apologies for the inconvenience.