I have a Google Tag Manger container that contains a Facebook Pixel injector tag and a regular form submission tag (with standard form submission trigger). However, when the submit button of a form is clicked (resulting in invalidation thus no submission), the
gtm.formSubmit event is fired with the
'https://www.facebook.com/tr/'. This event is captured by Tag Manager's standard Form Submission trigger, thus resulting in a false-positive form submission.
I had to confirm the Pixel as the cause by pausing the injector tag and testing. Of course the tag was not triggered.
I don't understand why the Pixel is firing this event on submit button click.