Yes, it's because they are bundled games.

It is just an error. Don't worry, you really do have the contribution that all that adds up to, you just will never see it. Keep donating bundled games.

The amound of CV you get from bundled games is capped to $30.. if it exceeds that.. you get part of the extra (i.e. bundled CV byond 30) whenever you create a nonbundled giveaway.

Edit: The way it actually works is..
$25 of your bundle giveaways is converted to non-bundled CV.
Every bundle $ after that goes to your bundled CV
Whatever bundle CV you have gets added to your CV depending on your non-bundle CV.
The amount that gets added is 20% of your non-bundled CV. The remaining stays in the bundle CV pool

Edit2: I should have probably written it in a better way ._.

READ... THE... FUCKING... FAQ !!!!

Probably an error, pls spam the forum and moderator non stop. Maybe they help you with your situation.

error...of your BRAAAAAAIN -.-

yes its contributor error, keep donating

the FAQ.. in case you can't find it, is this tiny little white link in the bottom right corner of every SG page, due to it's placement you probably never scrolled down far enough to see it.

(Edit: I never noticed it was in the forums too.)