I have 4 nest boxes, 3 are plastic bins and one is a wooden nest box. Only 2 of my pullets are laying and they have been fighting over one of the plastic nest boxes and only laying in that one. But today one picked the wooden one and I just happened to be standing near to here it drop. It sounded loud so I ran out in case it did crack I didn't want her to eat it. The egg was in tact but had a couple "hairline" fractures where dropped. The shells are good and hard (as hard as store bought) and the bedding is hay. Of course for some reason they push all the hay to one side of the box. Has anyone else had a problem with eggs cracking from hitting the wood to hard? Should I take out the wooden box? I have 10 pullets. Thanks!