I've had this issue and tried finding a solution for years now, still no luck in other solutions so my work around is to change the length of the form (trial and error till you find what works for you). You can do that in the code that you get to put on your web page that is in this part:
Just change the data-formheight number to a higher number. Like I said, trial and error until you find the one that works best for that form.
If anyone else knows any better way around this it would sure be appreciated.