[Plugin: Social] Comments are not counting

I have this problem that the replies in the comment section of my blog don’t really increment. I can see them, but they don’t count, for example:

http://www.tobiha.de/2012/10/13/spectrum-run-release/#respond

It says 0 replies, shouldn’t it say 2? Or are Retweets not counting?

http://wordpress.org/extend/plugins/social/