Since the Last.fm update (when you connect via the website and not the settings), I have noticed that sometimes songs get scrobbled twice. I haven't been able to figure out the scenario when it happens, but it has occured both when playing from iPhone and from Mac. 

Here is a screenshot of some recently played tracks, and I know for a fact that I only played each of them once. Still, they get logged twice.

By looking at the time, some of them are the same. It seems as if the second, faulty scrobble is sent at the same time as the current track.

Any ideas?

Spotify Premium

iPhone 6s - iOS 11.4.1

iMac Early 2008 - OSX 10.11.6

Sweden