FB Ads: Slightly Differences in data to facebook & not working filters

I'm currently setting up a report for FB Ads clients. Most of it is working correctly, but I have a few slight differences in the KPIs compared to the data Facebook shows me. For example the CTR (link) shows a 0,01% difference. Furthermore the CPC (link) shows a difference of 0,01€. 

The second problem is that the filters I set up aren't working correctly. I set up a filter for campaign names. If I activate it the metrics are going crazy. For example is Facebook showing me a CPM of 3,14€ and Google Data Studio says 5,70€ (with identical campaign name filters). 

Any suggestions? 樂