When I google the error, I find the following:
- https://forum.matomo.org/t/cannot-login-due-to-form-security/44476
- https://github.com/matomo-org/matomo/issues/22956
- https://github.com/matomo-org/matomo/issues/15083
If I understand correctly, the cause in all cases was a Referrer-Policy header. It is possible that such a header is set by LiteSpeed. Does your hosting provider offer option to enable/disable this?
Please post the output of: `curl -I https://yourmatomo