There are still two bump buttons:
^{- One is in the upper right corner of the page while the other one is in the bottom right corner.}

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It looks like you're referring to another account and judging by the board in question, I'm guessing that a Newbie user might be the one that commented on your thread, so the following quote might be the reason for such behavior:
^{- Read: Bumping changes on some boards}