Not sure which forum to put this on since this is technically an issue with the site and not any game in particular.

I own all the Endless Legend and Dungeon of the Endless DLC, and I linked my Steam account, but I only have badges for the base games.

Is there something I need to do to unlock them (re-input the CD Keys or something?) or is this a bug?

Ok, an hour ago I suddenly unlocked all the badges, so either a mod did something or there's just a delay in the system. Issue resolved.

The Steam API can sometimes be quite slow in processing the look-up.

Apparently. I more found it odd that it more or less instantly found that I owned the games, but then took the better part of the day to get the DLC listing. Seems awfully inconsistent of Steam.