CF7 PayPal Add-on Breaks Redirect

Hi
Love this quick integration but I’m having problems using it with the new CF7 redirect method (
document.addEventListener( 'wpcf7mailsent', function( event )
added in my functions.php)
With the CF7 PP Add-on enabled (for my form on https://merseysidedigital.org.uk/gdpr-starter-pack-order/), all my forms get submitted but don’t redirect to my “thank you” page – they just give the “message sent” message with a suffix e.g. https://merseysidedigital.org.uk/contact/#wpcf7-f95-p7-o1
If I disable the CF7 PP Add-on my forms redirect OK to my “thank you” page as per my functions.php
I tried setting my javascript to only work on the non-PP forms but still doesn’t redirect.
TIA
Kev

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