My acting theory? Since the real world has mashed up with a world made of data the data part of the world can be glitched like a computer. Things frazzle out or a virus gets it mucked up. I'm sure Gizmo could explain it better.

But magic is also an option since the black and white thing also effected our memories.

One week there was a glitch that turned the city into a series of race tracks and we each got our own go-kart.