60x Burning Possible?

I was backing up some stuff, and the thing (using nero speed tweak) reached 52x @ 60% of the burn…after that, it kept rising…until it finally reached 60%, and stayed steadily there for a few seconds, before dropping to 57% to finalize the burn. Weird heh? Is this possible? Or is it a display bug?

It’s a bug. I’ve seen this before in this thread (look for Dee-ehn’s post).