So i've been using vgchartz database as kind of a log on what games I have bought or will buy in the future, and when trying to pad out my xbox 1 collection for example, some games do not have the add function, usually if a dev or publisher is unknown I think. I can't seem to find a way to fix it, but it sucks I can't complete my collection on the otherwise wonderful looking setup.

Games of note for xbox are max payne 2, doom 3 ressurection (expansion thing), and I also couldn't add other titles like spot goes to hollywood for the saturn or flicky for the genesis.

Any way I can fix the games myself or do I have to ask every time? Thanks!

You can fix it if you add the correct release date for each one.
For that information I recommend gamefaqs.com.

Just encountered not being able to add to my collection today, but it was with a new game, Namco Museum Essentials. As to adding games to your collectoin that you used to have but no longer do....seems a bit counter-intuitive. If you don't have them, they're not in your collection.

This seems to be a major problem. If the game was never released, you can't possibly own it. While in the past we supported this, the idea is that if it isn't released instead you'll click "wishlist"

Well I own a lot of the games and will own all of the games in my list at some point, im currently collecting the missing pieces now (for example, I own every xbox 1 game on that list now)

Vgchartz just has a very nice layout for easy organizing of my upcoming collection.