Delay between hatching?

[lolafanau]

So 11 eggs. 8 polish, 3 ayam.
All from same supplier, in same incubator.
First hatched yesterday morning. We now have 6 hatched in total, 5 of which have hatched throughout today, all polish.
1 ayam has pipped early hours of this morning but no further progress. Not sure when to check on it?
1 ayam I dont think will hatch as its seemed much smaller and under developed since lockdown but still alive.
Remaining ayam I couldnt quite tell if it had internally pipped but I dont think so.
Remaining 2 polish have not internally pipped.
It is now evening of 2nd day.
Is this normal to have such a delay between eggs?

 

[lolafanau]

Chick update.

4 polish in brooder pen doing well.
2 polish in incubator fluffing up. 1 of which seems okay but could still be a bit iffy if it's back end(umbilical area) doesnt dry up properly.
2 polish eggs remaining unhatched, candled and 90% sure both dead? Can barely see any veins, no movement.

1 ayam pipped. Seems to be resting although verging on 12 hours.
1 ayam seems okay, cant tell if its internally pipped or not.
1 ayam very much alive and moving, veins visible etc but VERY small so rather confused there?

Any advice appreciated.
First hatch was yesterday morning. Following 5 hatched throughout today.

 

[JaeG]

It may be that your incubator has warmer and colder spots (most incubators do). It's generally advised that you rearrange your eggs in the incubator every few days to even out any warm and cold spots.