Configured forum address appears to be incorrect.
Your forum address is set to domain.com/forum while correct value appears to be domain.com/.
Links in e-mails sent by Misago will be broken.
and if i replied to someone's post it is showing URL : domain.com/u/testuser/4/
Addon:
"Links in e-mails sentby Misagoill be broken." This text can be fixed too.