Same thing happens to me and I live in central texas where the humidity is actually pretty high. All mine died my last batch. 2 made it to the last week. One died day 17, no reasoning as to why frm the eggtopsy. The last one pipped on the face down portion of the egg and suffocated while I was at work.

I set 10 chicken eggs and 5 duck eggs (3 not fertile, 1 died at day 8, and the last one is in there not moving anymore) Right now I have about 6 chicken eggs left after throwing out the no good ones. One I don't know if it's still alive because it's not moving inside but it pipped internally. I did everything I could this time. I didn't candle until the last week after the 7 day mark, i used gloves, and I kept everything stable. I wonder if this is why my hens aren't broody bc maybe their children aren't meant to be here. If I can just get 2 or 3 to hatch

I think I may feel somewhat capable lol. I have a cheap-o Little Giant incubator.
This makes me want to quit but, My birds are laying all these eggs and I hate for them to just sit out there and go to waste when we want more birds. I've been giving eggs away. I haven't started eating them myself until I'm done trying to incubate them. It would feel weird to eat them while I'm incubating their siblings LOL.