If you sort all Half-Life maps by date in ascending order you can see it mostly happens in clusters, apart from the couple of standalone maps. I'm currently browsing through all of 'em but so far ( page 40 from 1181 ) it seems to have happened only to 2 clusters from the very early ( 2004 ) uploads.
About the map without screenshot, it's because the dump contains the wrong category.
For example, cs_16fighter. The category in the dump is 127 (DM maps), when it should be 1 (CS maps). I fixed it, but I guess there will be a few maps where the category was already wrong.
About de_aztec. I'm not sure how exactly it works, but the image link uses a redirection. From what I see, the screenshot has been originally uploaded in the wrong category (CS). I set the category to CS, the screenshot appears. I put back the DE category, the screenshot is still here. Probably related to the date change and the redirection needs to be regenerated.
Same for awp_map. Looks like a bunch of maps screenshots were uploaded in CS category. Not sure yet if there a simple way to regenerate all without breaking stuff.
You speak of originally but I have browsed through all Half-Life 1 maps per category multiple times for various reasons and I never came across clusters of maps being in the wrong category. Especially not old maps & definitely not system maps ( like for example de_aztec ). Must have to do with the attack on the site.
After the attack not only the author was changed to one single name, some maps were moved to a different category, and so including their attached mainscreen. After applying byplt's backup, all the maps that were moved due to the attack were now back in their "original" category. But sadly not the mainscreens so it seems.
Ah, right. I did not think the resources would follow the new directory. I restored directly the database. I guess I should have made a script to use the function used to change a category. It's not too late though.
Do you still need a list of some sort? Of course there will always be maps that didn't had a mainscreen before the attack but I'll try to exclude those as much as I can.
The mainscreens are not lost, thankjs. They were moved to the wrong directory. Right now, I've run some basic scripts to move any files if exists from 2 (CS maps) to their current category. This way, if there are files that exist, they will be moved.
17Buddies's website offers at this time 107 919 total uniques and verified maps including 59 037 HL1 maps, 45 579 HL2 maps and 3 303 CS:GO maps, representing 372,33 GB disk space.
There were today 635 maps downloads (698 yesterday) representing 2,48 GB transfered (3,03 GB yesterday).
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