1 unique visitor in google stat+ but more in Piwik

I have a wierd issue where my google statistics are giving me 1 unique visitor on several pages. Seems like it is missing several visitors. I know for a fact that i have an issue with piwik not counting the logged in users but piwik does still count more users.

Also one of the sites sitex.example.com in the network does show the same results as for the whole network example.com

Best Regards,

SP