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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 have tested your form and was not able to replicate the same issue. Can you please provide a screenshot showing the display size error you are experiencing? Thank you.
Below is a screenshot I took from my Laptop.
In response to this similar thread.
Thank you for the screenshot you have provided. Please try using the IFRAME embed method. and after changing the embed method into IFRAME, please clear your browser cache and see if it solves the issue.
Please let us know if the issue still persist after changing the embed form into IFRAME.