odd behavior when editing contact form

Hi,
I’m seeing some odd behavior when editing the contact form.
Every time I edit something in the contact form and save it again, the form will add a subject field to the existing form.
And it always does this after the first field (name) in the form, and also ‘reshuffles’ the order of the rest of the entry fields.

I didn’t realize this until after doing some tweaks/save and ending up with 5 additional empty subject fields in the form.
Enfold 7.1.2 and WP 6.9.1

Any idea what can cause this behavior?

rob