Doesn't work if there's 2 forms on a page

On my site, in its current configuration, there’s an omnipresent contact form in Russian, hidden in “attic drawer” and triggered by “У” at the top right of every page. Leads works on this form just fine.

However, when it comes to my main contact form, Leads doesn’t collect any data at all. No events are triggered when someone hits “Submit” here. My guess is, you only collect data from one form per page. Right?

What can we do about it?

PS: All forms are Gravity Forms, with Conditional Logic and Anti-Spam Honeypots.

https://wordpress.org/plugins/leads/