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

If it was an odd occurrence, would likely be only one bearing. But both tells me method used to install bearing was not right.
I prefer warm bearing/cold shaft and a long pipe to fit inner race to drive /press it on.
The appearance of bearing spinning in housing is likely right from day one. Cracked so fit was loose.
I have no opinion regarding bearings other than originals did the job, they still should.