Google Analytics date its not the same in Power BI

Hello everyone 

I saw a few old post about this, but im still have the following  issue...

1) I connected 8 Google Analytics sources in power bi and i want to see the sessions, user and new user but if i compare the date with the google analytics ( in the same period) its not the same, but its close ( But not for user, the difference its very huge). Do you know what can id to to fix it?

2) I have the similar problem for the bounce rate, Wich is the best way to get the bounce rate from analytics? Because if im campare the average in power bi with the result in analytics its not the same.  And also if if use the sum function or the average, the data does't make sense. Maybe I need create  a new metric?

Thanks a lot fot your help!