Fake users registration

-- HikaShop version -- : 4.6.2
-- Joomla version -- : 4.2.3
-- PHP version -- : 8.0.24

Hello,
since I upgraded the site to J4 I'm noticing a lot of fake user registrations.
I still have the Hikashop recaptcha plugin for registration but it doesn't seem to work as well as before.
As the registration requires the email check, none of them are activated.
Has anything changed? Should I update the plugin as well?

Thanks!
Davide

Thank you
I'll be back only if problem persists