I tested your tool by tracking the submit button using all three of your tracking methods to give you best chance of success. Here are the issues I found:

1. Form submissions aren't tracked when users use autofill and press Enter to submit the form. Most users have browser-stored form data, so this is a common case.

2. Even when users interact with the submit button, your tool doesn't track successful submissions properly. Here's what happens with the three tracking options and different user behaviors:

User clicks submit (form blocked by validation):
All tracking options count it as a conversion.

User presses Enter while focused on submit button (form blocked):
No conversion is tracked.

User presses Enter while focused on the first field (form blocked):
No conversion is tracked.

Really hope this can be fixed.