Does a full crop explain chicks strange behaviour? Please Help

[ReginaFluffy]

If the chicks crop is full does that explain the chicks unusual behaviour like not being as energetic as usual? Or is this something more serious than just a full crop? I've got 6 Easter Eggers about 2 weeks old now and they are usually always rowdy and like any slight noise or movement will catch their attention but this particular chick is acting very peculiar, slow, droopy, and the only thing different from the others is that her crop is full.. Can someone explain this pls.

 

[HappyClucker7]

Is the crop full at all times? If it is, then she could have a crop issue like sour crop or impacted crop.

 

[coach723]

What do the chicks droppings look like? Any issues with pasty butt?