Coker wheel bearings sliding off

Hi,

I replaced one of my coker wheel bearings. After a few long rides,
the new bearing is now rotating outward from the hub and is applying enough force to spread the frame.
When I removed the bearing I noticed that the black paint is worn off the hub. Also note that the replacement bearing was not from the same manufacture as the original coker bearing. (However, the dimensions were supposidely equal.)

Did I possibly install the bearing wrong which ruined the bub from excessive wear and rubbing? Or should I try installing the same bearing as the original?

Thanks,

There are spacers you can position between the crank and bearing to keep them from slipping. Contact UDC and order some. I’ve had slippage once when I wasn’t running spacers, so now I run them on all my unis