I have that happen pretty frequently with one girl in particular.
After a lot of spying I discovered the reason!
Maybe you'll discover the same thing happening at your chicken house.
Some girls sit forever to lay their eggs, then linger there pondering the meaning of a chickens life, while others are party girls. They get it done quickly then get right back out there because they're afraid they might be missing something.
Either of these things can be a factor here-
Sitting too long, or not quite long enough.
When the egg exits the body it's a little wet. If a hen sits for some time it can stick to her feathers, especially if she has a " fluffy butt"!
If she sits too fast this can happen too.
They'll get the hang of it.
Some people suggest a little fluff trim.
They hop out of the nest after a while and after taking several steps or jumping off the ramp.....
Plop!
The egg unsticks and falls off!
If it gets cracked just take it in and scramble it up in a pan shell and all and give your girls a nice breakfast!
If not , it's fine to eat.
*if you are concerned that it's "dirty" you can wash it.
Just make sure you wash it in a water temp WARMER than the egg, washing it in cold water can draw bacteria inside through the shell.
Hope this helps some!