Lord Sorril, thank you for your response. I’m using a DIY incubator made from a wine fridge, with a heating foil and a Danitech thermostat – which I dare say is the most reliable thermostat in our region (Central Europe). Heat is distributed throughout the incubator using a fan. The probe inside was in direct contact with one of the eggs. Unfortunately, I don’t remember whether the hatchling from that specific egg turned out fine or not. I didn’t notice any issues with the previous 4 clutches. However, I’ll definitely focus on checking heat distribution and verify it through measurements – it does make sense.