“No results found” on Fields Mapping

Hi! Great plugin.
I have 2 different contact forms on my website. I created one Feed with the first one and the integration with Hubspot went smooth and works perfectly. Now I’m trying to set another Feed for my 2nd contact form, but when I have to select a Field in the Fields Mapping section, the dropdown doesn’t show any options, I get “No results found”.
Could you please assist?
Thank you