Isa brown not hatching

[Hannahducks]

I have two isa browns in a Brinsea mini eco incubator and one of them seems to be hatching the other not so much
Humidity I think is ok
Last time I candled (3 days ago)
The chick was alive and moving around
But there is just no signs it going to hatch
Can I save it or is it too late?

 

[sourland]

What day of incubation are the eggs on ? Hopefully by now they have hatched.