I'm unable to replicate this issue, but my development version has had other changes made to it in order to clarify the changes made to the latest version of AUT.
In the latest version, in order to improve upon performance, mentions that were made in posts the user does not have permission to see are included in the list. For such posts, "N/A" is currently displayed.
What I've also discovered is that soft deleted posts would also show "N/A".
Tonight I will be releasing a new version that distinguishes between "Hidden Posts" (i.e. posts where the user has no permission), "Deleted Posts" and "Moderated Posts".