A disputed flag is a flag that was issued on a post that then received an "invalid flag" flag from a 10K+ user. Both the original flag and the flag used to mark it as invalid will be listed as "disputed" in the respective user's flagging summary. Once a flag has been disputed, its state will not be changed by any additional action on the post. 

Additionally, an edit on a post will result in any "Very Low Quality" flags attached to it being disputed. This is because "Very Low Quality" flags are intended for posts that are unsalvageable, and an edit to the post suggests that there's a chance it could still be saved.

Due to [a change](http://meta.stackoverflow.com/questions/95017/how-should-we-handle-flag-weight-for-invalid-flags/95029#95029) in how [flag weight](http://meta.stackoverflow.com/tags/flag-weight/info "what's this") is managed for this situation, disputed flags do not impact your internal flag weight value.