JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
To avoid this kind of issues, I suggest you to use iFrame embed method while you are embedding your to web page. Below, you will see the example IFrame embed code. As it is seen, you don't need to take the whole structure of it, the content between <iframe>...</iframe> tags is enough to embed your form. Also, you can increase the height of the form on red marked area.
I hope this one will work for you. If it is not, please let us know. So, we can try different things to beat this problem.