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Please share the web page URL where you have embedded your form and we will take a look.
The primary reason could be the script / css conflict between your form and other codes available in your webpage. To resolve this issue, I would suggest you to embed your form using its iFrame embed code. The following guide should help you: https://www.jotform.com/help/148-Getting-the-Form-iFrame-Code
We will wait for your response.