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My new incubator is doing that as well. I think they may be more stable full. I have put a couple of slim bottles of water in there, on their sides, and I am going to see if the temps even out.
Also I have heard having the incubator in a cupboard really helps, because the stable cupboard temperature helps keep the incubator temperature stable. However, I am reluctant to carve a notch in my cupboard doors to pass the electric cord through. However, you may be keener to try this than I am, so I have passed it on in case it helps.
Good luck!