trentonlf: Some games you've given out in the past have either dropped in price or have since been bundled so it reduces your total CV.
Tallima: I read that giving away a game before it was bundled does not reduce your CV. Only if you give it away shortly before it's bundled.
I've had the same problem (my cv went to 4.98 from 5.02 and I lost a level.....)
The main cause is that steam glitches when providing prices for games. The most recent example would be "Goodbye Deponia" that was priced at 100$ instead of 20$.
You can wait a few days (or a week) to see if everything goes back to normal. Steamgifts synchronises the prices with steam every day, if I recall correctly.
You can also check the details here:
http://www.sgtools.info/