So you see you're not alone.
My first hatch was with my own mutt flock, and with a cheap Little Giant still-air incubator. Wow was it a failure. Only 2 eggs ended up fertile though the bator was full, and both died around their first week but I didn't really know that, so, I waited through lockdown, nothing happened, then I opened the eggs to see some pretty immature embryos, dead. It was depressing.
Second incubation I did both backyard flock mutts and shipped Ameraucana eggs - Backyard flock mutts again weren't too great, Ameraucana eggs weren't either but I did get two chicks from the Am eggs.
Third time around I chucked my crappy cheap incubator for a new GQF / Hovabator, got more shipped eggs, and had a great success. Since then things have been great.

My first hatch was with my own mutt flock, and with a cheap Little Giant still-air incubator. Wow was it a failure. Only 2 eggs ended up fertile though the bator was full, and both died around their first week but I didn't really know that, so, I waited through lockdown, nothing happened, then I opened the eggs to see some pretty immature embryos, dead. It was depressing.
Second incubation I did both backyard flock mutts and shipped Ameraucana eggs - Backyard flock mutts again weren't too great, Ameraucana eggs weren't either but I did get two chicks from the Am eggs.
Third time around I chucked my crappy cheap incubator for a new GQF / Hovabator, got more shipped eggs, and had a great success. Since then things have been great.