New disk pads glazing during bed-in procedure
This is something that can happen with new brake pads when they are getting too hot before being bedded in properly. You should be good to go after cleaning the disks again and with the sanded pads. You just have to bed them in again, this time maybe a little more careful.
I had experienced this by myself a few times and this method always worked for me perfectly. The performance was the same compared to pads that didn't need a second try.
Edit: Bed in one brake at a time as mentioned by Jeff. It's easier to modulate the breaking power if only using one brake. Using both while bedding in would result in unequal results between front and rear because of the weight distribution.