Seems that eggs aren't stacking properly or the stacking number changed. Tried to add eggs to a stack in my chest and it broke it up to two stacks.
Ah... I see now. It changed to 19 max in a stack.
What version are you playing and do you have any mods?
I'm still getting 16 to a stack in 1.14.4
Same thing in 19w38b
Always been 16 so far as I know. I always accumulate a few stacks in every new world to start up my auto chicken farm/cooker.
Learn something new each day