There is a helpful summary of one's flags just to the right of one's flagging summary:
Your flagging history
1024 moderator attention flags
1023 deemed helpful
1 declined
512 disputed
128 posts marked spam
64 deemed helpful
32 posts marked offensive
4096 comments flagged
32 deemed helpful
32 declined
I'd really like each of the "declined" and "disputed" to be hyperlinked to a filtered list of exactly the flags I cast that our moderators didn't find helpful, so that I can more readily learn from my mistakes.
The existing interface means I've got skim through the list and look for the lines that don't say "helpful" among 14 pages of flags. (Your pages may vary.)
disputed - a moderator reviewed your flag, but found no evidence to support it
.