Registration button redirects to home page after upgrade

Hi
Since updating to J! 3.10.2, php7.4 and EB 3.17.2 registration for an event stopped woking and redirects to my home page instead.
If i turn Joomla SEF urls off then the registration link works ok.
I have set a Menu item and Event ID in the SEF url settings in EB config.
(Tuan you recently did work on this website with a custom stripe plugin to allow multiple stripe accounts (although i cant see how that would cause an issue))
See this example
lecheileonlinelearning.ie/webinars/primary.html click the register button and you get redirected.
Do you think there is an issue with the .htaccess file perhaps?

Hello

For this, better submit a support ticket sending us super admin account of your site and tell us what we need to do to see the error. We are going to check to see why the issue happens and get it sorted

Regards,

Tuan