Hi @amunoz,
I hope you are doing well today!
This is more likely to be some plugin or theme conflicting on your site. I suggest to perform the following tests in order to find the plugin or theme causing this.
Please make sure you have recent backups and perform this operation on your dev/staging site if possible.
To learn more about a plugin conflict test, please see this guide below:
https://wpmudev.com/docs/getting-started/getting-support/#conflict-test
Check out this handy flowchart of the troubleshooting process detailed above.
https://wpmudev.com/wp-content/uploads/2015/09/Support-Process-Support-Process.gif
Please let us know the results and if this does not help to identify the issue then kindly share an export of the form with us, so that we can check further.
You can find more info on how to export the form here : https://wpmudev.com/docs/wpmu-dev-plugins/forminator/#import-export
After exporting, please share the code using a service such as https://pastebin.com which is free to use.
Please always make sure to use such service to share the code and don’t post the code here directly as it will most likely be unusable.
Kind regards,
Zafer