Msn bot adding rating

Hey,

I am noticing that the msn bot crawling my site is rating posts with 1 star

Is this a known problem?

msnbot-65-55-107-146.search.msn.com
msnbot-65-55-107-165.search.msn.com

http://ww.wp.xz.cn/extend/plugins/wp-postratings/