How to stop chicken eggs from spawning in minecraft?

I built this big treetop house but in one of my rooms, a random chicken egg keeps "spawning". I've killed the chickens around the area but the egg keeps showing up. Is there a way to stop the egg from returning in that spot? Why would it keep coming back?

An egg can't spawn randomly like that. Maybe the item is glitched on a block ( if it goes up and down ) you need to detroy the block where the item is coming from