It seems that each time I've flagged a flag as an "Invalid Flag", it's been disputed.
The question here was flagged as "Low Quality". I flagged the flag as Invalid, it's status is now:
disputed - a moderator reviewed your flag, but found no evidence to support it
The answer here was flagged as "Not an answer"; My invalid flag was disputed.
The answer here was custom flagged as "Duplicate answer"; My invalid flag was disputed.
The answer here was flagged for a reason I can't remember; the answer has since been deleted by the owner, but again, my invalid flag was disputed.
If it was clear that the moderator believed the flag I disputed was legit (e.g. by taking action and deleting/ updating/ commenting the post in question), I would be rest assured that I'm using the Invalid Flag wrongly.
However, because no moderator action was taken on any of the flags (which can read as "the flag was invalid), why are all of my "Invalid Flag" flags getting disputed?