They can still be bundle titles, even if you bought it as a gift, it sucks i know, but those are the rules.

First reply answers your question

Just adding to ElChosy, since the site can't determine the origin of the giveway (key vs gift) all games that were part of a bundle (HB, X Gala, etc..) are forever marked as bundle games and you only can represent 20% of your total value.

See the bundle list and the rules for bundled games calculation http://www.steamgifts.com/forum/Ihcl4/how-were-planning-to-fix-bundle-keys-and-contributor-values-option-1-revised