From the BOTTOM!! 

I went out to pick carrots tonight, and noticed some of them were really short, so I on pulled one.  Nearly the entire green was in the hole.  When I pulled it out, there was just a little nub where there was once a carrot!  Several were like this.  Only the orange carrots, but I suspect it’s just a coincidence.

We haven’t had any problems like this before - so WEIRD.  Anyone know what it is???