Losing contrib, cause game find its way into a bundle

What was the value of SotS Complete back then? It is valued at 9.99 USD now, maybe that's the change. If price on Steam drops, your contributor value drops accordingly as it is computed based on current (base) price.

Otherwise AFAIK it is not intended to lose contributor value after something gets into a bundle if you made your giveaway before date posted on the bundles list

Bundle games only become bundled value after the date that it appeared in the bundle. So if you gave it away before it was a bundle game then you're safe. It must be something else or a price drop like Award said.

It would have been one more games dropping in price by a total of $15 (the other $3 being bundle value ;lost from the decrease).

BTW OP. your CV decrease is from homefront... it was bundled on steam with guide book for 35 dollars... but they lowered it to 20 again same happened to me

Well If you really lost it because of bundle, this is unacceptable thing bla bla.

It's not due to Sword of the Stars, it's due to Homefront. Homefront was always 20$, however for some reason the price on SG was 35$ (due to some pack it probably was in). That was recently corrected, I believe.