It’s when the air cell stats to ho up one side of the egg more
Instead of just a round Circle at the bottom
That part should face up
In my pictures I drew a line of where the air cells are
One is really far up the egg now
That baby has internal pip
The bigger egg is dipping up the side but not...
If there is no external pip I would do a quick candle
Make sure eggs are sitting air cell dip facing up
If there are internal pips you can poke a tiny safety hole the size of the tac pin