Campeign showing "-" visits but multiple conversions

When I set my date window to a time when I know I got 42 clicks and 2 conversions it shows “-” visits but it does show the 2 conversions. The URLs are tagged in the Google format but they’re Facebook ads.

I had hits visits from the campeigns selected, 168 of them, or at-least 168 people clicked the ads according to Facebook.

It looks like a bug indeed! Can you see this problem in other places? can you also see it on demo.piwik.org ?

thanks

I dunno, the demo doesn’t have campeigns.