Using Dungeonbuddy, EVERY time a repair run is triggered, no matter the location in the world, HB will indefinitely (yes, indefinitely!) try to click inside of a mailbox while running into it - I have seen this happen at multiple mailboxes in Orgrimmar, Shrine of the Two Moons, etc. See below for what it's doing: Essentially, this would go on all day if I was afk and would give people the chance to submit dozens of reports before I have time to do anything about it. The only work-around appears to be stopping (or pausing) HB, manually repairing and starting HB again. This will make HB think a repair run is not necessary and it will work until the next repair run is triggered. At the end of the log, you can see that it's basically been using CTM in the same spot for at least 60 seconds before I stopped HB (the above screenshot was taken during the below log time frame).
I have not tested it on any other botbases. I will assume, for now, that it is only during DB and will re-post (or bump this topic) here if necessary. Thanks, CG!