Hello,
I thought that I was seeing the same source/medium twice in the channel report tablet. (fvdublin.piwik.pro, for domain thebaileyatbridgepark.com, last week):
gfs_social / gfs_social
gfs_social / gfs_social
I then realized that the 2nd combination has a space at the end of both the source and the medium:
"gfs_social "
"gfs_social "
Piwik Pro is showing some extreme sensitivity!