Redirection on spesific form in page

So i tried to do experiment for redirection when someone do form entry in page that have 2 form in it (let’s call it Form A and Form B).

I put a DOM event that contact form 7 provide for this situation (guide : https://contactform7.com/redirecting-to-another-url-after-submissions/) on Form A and not putting the script on Form B

However the DOM event got trigger when i submit data on form B.
is there any solution to not trigger it outside using plugin ? do i need special DOM event ?

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