cachemgr.cfi General Runtime Information shows negative memory values

[Sebastian Muniz <basurerosebita@xxxxxxxxx>]

Hello all.
I am trying to understand how Squid allocates resources.
It is weir for me that the General Runtime Information shows negative 
values!
You can check it here: http://pastebin.com/EyVPB3Qu
It is a bug or a problem in my installation?

Thanks
Sebastian