Xobor.com - official support forum

If I tag a member in a post or in a comment on my forum with @username, the system sends a private message to the tagged member, without a title and which cannot be opened, as having been sent by me, instead of sending the tagged member a notification (an email notification I suppose) letting him know that he's been tagged in a post by me. I figured this must be an error, is that right? And if it is, is it fixable?

Thank you kindly!