I wrote the following answer a long time ago. It recently had a bounty placed on it to receive more attention. My answer was up-voted
4 times, from
11, but my reputation did not increase. Could anyone explain why this occurred?
The answer is a Community Wiki; you don't gain anymore reputation since the moment it becomes a CW, not even when the answer is accepted from the user who asked the question.
The only users who can change back a post to not CW are moderators. Flag the answer for moderation attention, and if the moderators notice your edits really improved the answer, they will remove the CW from the post.
I am not sure you will get back the reputation from the votes given when the answer was CW, though.