For some reason the moderators have ignored my recent flags. My flags have not been declined, deemed helpful, etc. Is there a reason for that?
Mariano is right. Nobody is ignoring your flags.
However, this is because nobody can see your flags any more unless they look directly at the flag history of a post and even then that's just a record of your flag, not an actionable thing.
You had a large number of flags declined (more than were found helpful). As a result, your flags are no longer shown to moderators and cannot be acted on either way.
At the moment there's unfortunately no way for you to recover from that.
Often when flagging it is the case that there are several open flags on the same post.
Moderators cannot clear just one flag, even if they acted according to the suggestion in the flag. In such cases moderators often keep the flags open in order to decide how to clear them.
(Note: I have never been a moderator, but I sure as hell flagged a lot. Roughly 950 flags - 780 accepted (and 120 disputed, most of which are invalidations).)