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.
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I did test JotPoll app and I am unable to replicate the issue you are having. I was able to sign in successfully. Please check the screenshot below:
Did you click on "Allow" button to allow JotPoll to access your JotForm account? I would suggest you to please clear your browser cache and then try again to sign in to JotPoll. The following guide should help you how to clear browser cache: http://www.wikihow.com/Clear-Your-Browser's-Cache
We will wait for your response.