When you click sync in your Anki, does it say media downloading?
Also, when you go to the AnkiHub addon, does your media sync says idle or downloading?
You can also try this:
Please try resetting your local changes. To do this:
Go to browse in your Anki → at the top click on the ankihub addon tab → press reset all local changes
This will restore everything to what AnkiHub has unless you have specifically protected those fields
What fields is the missing media found in?
On our side, you have unprotected the additional resources, first aid, physeo fields which we do not sync. This will result in missing media (since the images are not synced)
Only physeo can be acquired by having a subscription to Physeo and getting the media file they provide