Bumped posts are now visually distinctive with a blue top-right corner indicator, a 'bumped' label after the post's timestamp, and a 'bumped by X' message in the post's footer. As of 1.37.
It updates the last post time of the topic among a couple of other things. So if the first post is the last post, then that time will be updated. But it shouldn't change the actual timestamp you see on the first post - that should always stay the same as the time it was listed.
I pulled this quote from a thread for a different bug where someone was wondering about the timestamp of the OP changing, but the first part would indicate that what you guys are experiencing is normal & expected behavior, as the bump button updates the time of the last post to cause the bump.
Bumped posts are now visually distinctive with a blue top-right corner indicator, a 'bumped' label after the post's timestamp, and a 'bumped by X' message in the post's footer. As of 1.37.
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