Mine started to dimple about the same time, one of them dimpled a lot more than the others and looked exactly like that one of yours. It really hasn't dimpled much more, and is doing just fine. They are on day 52 now and I'm planning to wait till the first one pips before I cut.
If there is plenty of water in the bottom they are fine and it's completely normal. Once they get a little farther along you will notice a lot of condensation on the lid of the tub. You'll definitely know there is plenty of humidity in there at that point.
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