Facebook Pixel tracking not work for part of my forms

?I have installed your FB Tracking Pixel for Gravity forms and set Submission tracking for all forms I have on site https://www.chelseamotorcycles.co.uk

Problem is that with some of them Tracking is working ok (Test Events on FB Events Manager shows in real time how they are firing) – but for other? forms no events are sending to FB, even when all FB Pixel Tracking Feed settings for gravity form that fires events and not fires events were identical. In whole events aren’t sending to FB for 6 of forms?.
What could be done about that?

P.S. As this plugin is free, it is not possible to use ticket system of plugin developer’s site (it demands prove of purchase to create a ticket), which is bad.

The page I need help with: [log in to see the link]