Soft egg not in nesting box

One of my chooks has just laid a soft egg outside.  Is this normal?  I've found soft eggs before but always in the nesting box.  Any ideas why???

One of my hens lays soft shelled eggs occasionally.  She usually lays it as she is on the roost perch or getting off.  Think they can't control the laying of soft shelled as there is less resistance than a normal shelled egg so can sometime just pop out.

Try some cod liver oil on a small amount of bread to help with calcium absorbtion to help  prevent soft shells.  This is what I have been doing on the advice of other members and it seems to be working.

Good luck.