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@doomsdaychassis, I Found it! :0)
I had deposited some SBD to my Minnowbooster account. In my settings, I just found out the 'Automatic Promotion'-switch for comments was set to 'On'...
I'm so glad I had only deposited 2SBD...

So, mystery solved: I've paid for all those votes myself - lol

LOL @simplymike. Ok, I just laughed really loudly at my desk when I read this part:

So, mystery solved: I've paid for all those votes myself - lol

It was quite a search to find out where all those votes were coming from and quite a disappoinment to see that I didn’t think through my first Minnowbooster experiment :0)

Could make sense. I went into SteemAuto this afternoon to cancel all my autovotes. It was about that time that it started. I switched to steemdunk.xyz, because I think steemauto is pretty unreliable lately