Did you see any damage on those eggs? (from hitting the lid)I am unsure what row they were in originally in the turner but when I put them on the floor for lockdown they were the bottom row. They were all Orpington eggs too which were slightly to big for the incubator anyway and kept hitting the plastic when turning.
I didn't do an autopsy.
The Temp was always in the 37s but moved up and down a lot but my biggest issue with this incubator is humidity. Ive set the alarm so it bleeps if it goes below 30 (this is lowest I can set it) but it bleeps quite a lot. Then as soon as I put a small amount of water in, it goes up to around 65%/70% which is too high! I wish I could turn the alarm off as it keeps going off in the night!!!
I guess you candled before lockdown so you know there were fertilized?
How long did you leave the last eggs after the first hatches? If the temp.diff was high, then you could expect some late hatchers (although that didn't really happen with mine - disregarding the one that pipped super early)
Some people (regardless of incubator) cover part of the water reservoirs (it is surface area and not volume that determines humidity), so you could try that next time (cover half or whatnot of all maybe?)
Sorry about all the questions