Not knowing your exact setup here is my observation. Eggs on the left are fine but as you move right they dimple. I had this my first year and it was caused by the tubs not being sealed (just a lid) and the fan was at the end the eggs were dimpling. The air from the fan was going around and under the lid causing less humidity the closer you got to that end. Either spin your tub around or seal it if it is not already.
If you think this may be the cause for your eggs I personally would just spin the tub beings you are already at day 30.
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