Sorry, this is extremely vague.
At 20th February I noticed that a save was messed up (here and later fixes) and added a note on no:Wikipedia:torget. Then this is reported, and note that the summary does not describe the actual edit. It could although be trolling, but I start to suspect that this is a bug.
My edit at "Innvandrere i Norge" started out as an undo, and I am pretty sure it was no indication that the ingress would be duplicated.
The IP edit at "Digital Audio Broadcasting" seems to be a normal edit through VisualEditor.
Other reports that might be related