Something wrong with UTM's

I have a problem with dynamic retargeting and traffic on site campaigns. Usally I use dynamic UTM's in ads campaigns and my links looks like{{placement}}&utm_campaign={{}}

But here is a problem. In Google Analytics a lot of visitors (about 80%) from paid Facebook Trafic ended up in organic social trafic. It seems to be OK when you use 'social' as utm_source, but its 'social-ppc' and all the trafic from this paid campaign should be in 'Other' source.

Also I have a question why a lot o visitors come from when it should be{{placement}}&utm_campaign={{}}

Is it OK? Or is it a bug? Or I have problem with my own site which gives information incorrectly to Google Analytics?

Asked about 3 months ago