Planet Virtual Boy

I recently got a new vb. The seller said that sometimes the vb goes into "double vision," does anyone know what that could mean?

Double Vision? Isn't the VB normally in double vision with it's 2 screens!? That hopefully doesn't mean that the VB is broken and only works from time to time... (o_O)
But seriously, I have no idea what he could mean, let us know when you get it and that happens...

KR155E

It could just be out of alignment or need to be focused better.