Note that for a valid conflict test, the first test must be done withonly Gravity Forms enabled. All other plugins should be disabled, and a default WordPress theme without custom code should be used (e.g. Twenty Twenty-One).
If you don’t feel comfortable doing this in the live site, try creating a staging clone or sandbox setup for testing.
The reason why you were unable to replicate the issue is because I fixed it.
There was some script messing with the form. I could not figure out exactly what, but once I deleted and re-added all the elements on page there were no problems.
I obviously should have tried that before! Thank you for your help!