Hello,
I would be happy to help. 
A couple of things:
The ‘missing media’ function isn’t reliable, owing to a quirk between Anki and AnkiHub, unfortunately. So despite it listing a value there, essentially everyone has a non-zero value even if you’re not missing media
Separately, AnkiHub does not provide FirstAid media, as it is proprietary, so that media is not ‘missing’ per se as it’s not contained on AnkiHub at all. You can find a bit more information here: AnKing Step Deck Wiki
Separate from those, if you have images that aren’t displaying properly I’d be happy to help. The more context you can share the easier it may be to be of help. Screenshots are ideal, if you can, just so I can see what you’re seeing