Grey vs Black Rating Stars (in iTunes) [screenshot]

http://img33.imageshack.us/img33/6969/screenshot20120221at110.png

macbook pro (early 2011)
mac os x 10.7.3
itunes 10.5.3

hello!

here on screenshot, see grey , black rating stars in itunes. if click on grey star rating give new or same rating stars become black.

questions are:

1. mean?
2. how different?
3. causing it?
4. else need know this?

thanks,
yervand

 

itunes 10 mac: rate songs , other items

 

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