I've tried numerous times, and the fillable PDF Isn't converting my from?

It is a fairly complexed form with a heavy amount of conditional programming in it. Could the complexity affect the output to PDF.

Unfortunately, yes. The fillable PDF forms may be having issues with the forms having complex design and colors on the form. Also, any conditions on the form cannot work on the PDF form. Please take a look at the guide below that can help you with more information on the limitations of fillable PDF forms.

https://www.jotform.com/help/312-Fillable-PDF-Everything-you-need-to-know-about-JotForm-Fillable-PDF-Creator

Thanks!