Multiple Input Indicator
Sometimes imported pages have multiple inputs for the same value which causes issues when trying to submit the page. On the page builder toolbar you can see if there are multiple inputs of the same value. You can click the warning icon to see which inputs have multiples.
You can then locate the extra input on your forms and remove or adjust it to the proper input.
If you are having a hard time finding the extra input, copy this value and open the code editor to do a browser search for that value so you can remove or edit the extra input.