I did Automatic Search on three epis (3, 4, and 5) of the first season of a series. While they were downloading I went and searched for and opened another (existing) series only to find the three epis from the other series (the ones that were downloading) merged in with the episodes of the other series.
So the first season epis for the second series were listed like: 1, 2, 3, 3, 4, 4, 5, 5, 6, 7. The second duplicate episode opened the description of the first series episode of that number.
I went back to the first and the downloading had completed. I returned to the first series and the merged epis were gone and the epi list appeared normally again. So not really a huge problem, but interesting.