Odd missed 43-second OA next to an 8-second OA

[cathyf]

Looking at last night's data I saw something odd that I've seen before -- a flagged OA that was less than 10 seconds long. But what really stuck out more was that it was a few seconds before a completely obvious unflagged 40-some-second long OA. I reverted back to OSCAR 1.2.0, and it looks exactly the same. Then I loaded my data into Sleepyhead, and it shows the OA in the right place and doesn't have the 8-second thing marked as anything.

Here's some screenshots:
   https://www.dropbox.com/s/hb6eytevrxqlln...s.pdf?dl=0