I have my items listed numerically & have had a problem recently with my 2013 items. I now have 59 items listed & have 2 that will not stay in order. Numbers 1-40 are ok & numbers 41 & 42 consistently are after the last item added--ie, # 59 is no longer last. Early on, with less numbers, I had problems also, but now it seems to be only these 2. I have done many sorts & gone into that area & erased all & resorted to no avail.
I have just purchased the new imac & my os is 10.8.3. I had hoped the new computer would solve my problem, but it remains the same.