What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
Unfortunately, I wasn't able to replicate your issue. I tried checking your webpage where the form is embedded and the form is not flickering.
It is working properly when I tested it using Google Chrome, Mozilla Firefox, and Internet Explorer 8.
Please try going to your direct form URL (http://www.jotform.me/form/52771867494471) and see if the form is flickering. If not, then it means that the problem happens if the form is embedded on the webpage. Please try re-embedding the form using Iframe method.
If it is still the same, please try another browser to see if that works.
Let us know if you're still having issues with it. Thank you.