Is there any water (or wet objects!) in your incubator? I'm still learning but my understanding of humidity is it's not critical to be precise every day, more of an average over days 1-18. Rainy days it'll be higher, sunny days it'll be lower. As long as you're not too humid (like 50+) every day. You just want to see that the air cells are growing (showing evaporation) when you candle later on (or weight loss if you weigh).
No there is nothing wet and the humidity is 45% in the incubator. I don't want to raise the humidity if the eggs will suffer from a combination of the outside humidity and inside humidity.