In trying to solve the fact that I accidently deleted some articles (as there is no undo button I had to solve it manually) I entered back in the 10 articles (across 3 documents) into my review. So 10 articles added back in. At this stage, I had zero unresolved duplicates as I had finished screening them. However, on putting these 10 back in - my unresolved duplicates now stands at 1236?!! HOW! I don't understand.