Event form_submit not sent after submitting form.

Hello,

I have an issue on one of my new clients website with the last version of your Forms plugin. Colleague who sets up GTM there tells me that the event form_submit is not sent when the form is successfully submitted. This is the testing page with form - https://variabilni-aplikace.cz/kontakt-testing
On many our older websites with slightly older versions of your Forms plugin the event works just fine without any additional touch. How can I fix this or just make the form to send the event form_submit after the form is successfully submitted? Thanks.

Best regards, JS

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