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Are you referring to the button image on this form: https://www.jotform.us/form/62850725878166?
I checked that form and it looks like the submit button image is still there.
If in case you encounter this issue again, you can use the Form Revision History feature to revert the form to a previous version. Here's our guide on How to view form revision history.
Please let us know if you need further assistance.