While I am no expert here, I’m going to add that the health and/or genetics of the eggs is a factor not mentioned. Perhaps the eggs were deficient in some way and quit. Perhaps the chicks had a genetic anomaly that caused them to quit. Since this is your first time incubating, then you don’t have a previous successful hatch to compare it to. What source are the eggs from?
Recently, I did my first chicken hatch. Eggs from my flock. Several were clear (not fertilized), 2 quit. 2 didn’t hatch, but I only gave them an additional 24 hours after the others hatched. I used a cheap still-air styrofoam incubator, and had pretty decent hatch: 26 fertile eggs turned into 22 chicks. Interestingly, 3 chicks hatched with mild issues, two were corrected within 36 hours, one had to be culled. These three had same breed mom(s) -they hatched from same color egg, and only 1 breed that we have lays that egg. My guess is maybe a nutritional deficit (but all eat same feed), or genetics. So, something to consider for these eggs you are hatching.
good luck with the remaining eggs!
22 out of 26 is amazing! You're a pro!