Considering it is 4 clutches and no one random one, this is definitely an issue with the incubation process, and usually the most likely culprit are temperatures especially fluctuation which sometime go unnoticed if they happen for a short period of time and or overnight and when you incubate at 90 you have very little room to allow for that.
Some heat spikes will not affect hatchling but this depends on which stage of development the animals are in.
88 - 88.5 is usually a good number to incubate at 86 is feasible but again you are falling in the very low end and be better off to incubate in the middle between 86 and 90.
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