We use two non hubspot forms on our site through Elementor/WP. When one form is filled out, the contact is added to Hubspot. When the other form (created the same way as the other form) is filled out, we get the normal email notifications we receive through both forms but the lead info isn't added to the Hubspot.
I understand HubSpot does not recognize your Elementor form and that they're not picked up by HubSpot, is that correct? Are the email notifications you receive HubSpot notifications or Elementor/WP notifications? Could you confirm with your team that your form is meeting all the requirements listed in this resource?