If I understand correctly
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When you use the "back" button you are loading the page from the cache stored in your browser, not from the TFL server so the cache doesn't reflect new data until you load page from TFL server. That is done by either clicking a forum link (i.e Gen'l, Handguns, etc), or if you are in a forum, hitting your "reload" button
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"Quis custodiet ipsos custodes" RKBA!