iPhone cannot fill form because “Submit” menu obstructs the form.

I just created a web form on my computer. I am now testing the form. On iPhone, I cannot fill out the form because the "Submit" menu pops up in front of the form and covers the top half of the form. If I click Cancel, the "Submit" menu closes and I can see the whole form. Then, when I tap on a form field to begin filling it out, the "Submit" menu immediately reappears. While the "Submit" menu is open, I can fill out the lower half of the form, but cannot view or access the upper form because it is obstructed by the "Submit" menu. I sent it to my colleague and she has the same issue on her older model iPhone. We are a nonprofit school. We need to be able to send this out to our adult students and have no issues like this. Is there a way to turn off the pop-up "Submit" menu? Or is there any other work around?