Hello,
Let’s see if we can’t figure out what’s what. 
Just to make sure: the two decks, on separate profiles, are missing the same media or they are missing different amounts of media? Just want to make sure I’m on the same page with what you’re describing so I have the lay of the land correct in my mind.
If you can, can you let me know how you imported, or otherwise installed, the AnKing deck into your new profile? Knowing how, exactly, you went bout this may shed some light as to possible explanations for the discrepancy in media. Did you export/import as an .apkg? Or are you using the same AnkiHub account on both profiles?
Resetting local changes would be the way to force a full sync, of media and otherwise, from AnkiHub (which it sounds like you’ve done). We’ll keep digging to make sure we haven’t missed anything, but the only reasons I can think of that resetting local changes wouldn’t fully sync media are:
- You may have certain fields protected, which is preventing AnkiHub from writing to them.
- There may, in fact, not be any missing media and thus resetting local changes isn’t fixing the issue.
- It’s possible you might have a bug of some kind.
Just for clarity, owing to copyright AnkiHub does not provide any FA images so their being absent is to be expected. More information can be found here (AnKing Step Deck Wiki), but just pointing this out to clarify that this may not be ‘missing’ media so much as media that AnkiHub does not provide and, thus, can’t sync.
Given this context, it might be helpful if you can show me a couple of things:
- How are you determining that there is missing media?
- Can you show me an example of a card in which media is not displaying appropriately?
If you can help me by clarifying a couple of these points I’m confident we can dig a bit closer and hopefully get to the bottom of things for you and get you squared away.