I remember that post, but I don't think it is a glitch. From my recollection, the post you linked is the ONLY one that showed evidence of someone at UA admitting it to be a glitch that they planned on fixing. It has gone on long enough that I think it was either deliberate, or they have come to like it the way it is and will not fix it.

Now as far as the OP's issue, I have no clue what the issue is, but it may have something to do with the recent fare class changes and the clean up associated with it.