Event Ticket Plus bug compability

Just to report this issue:

I have a website that uses Hello theme and Events Calendar and Event Tickets Plus. And in the attendee registration page, it gives me a not found page error.

The problem is with Hello theme because if I use Astra theme or other them the bug does not occur.

I do not point you to the website, because I let the site with Astra Theme. But put here this message just to inform you or other people who have the same problem.