Lisnaholic

Yes, I've had that same experience: click on the last page number shown in that little row of boxes, and it throws you back to the previous page.
At first I thought it meant that someone was at that very moment posting or editing a message, but as it can stay that way for a long time, I rejected my theory although I had nothing to replace it with.
Currently reading Voodoo Histories, about conspiracy theories, I now realize that it is a glitch caused by the CIA/Mossad monitoring of MB.

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"Am I enjoying this moment? I know of it and perhaps that is enough." - Sybille Bedford, 1953