What would cause my barely used green bearing to do this?

I'm running green bearings, mostly street. No issues yet. For me, my adjustors were frozen and junk. Made sense to go with green bearings. Also, I have another set of axles coming with green bearings because I'm going to be running a spool. And yes, I'll drive that on the street also. If I run into a problem, I'll post it. So far, so good!