What if it is just Lorem Ipsum by someone who could draw but not actually write?
Or, there's something called "spirit writing" isn't there, a sort of written form of speaking in tongues? Presumably the doing of which is also considered to be it's own reward.
Heck, perhaps a scribe went psychotic.
Seems a bit of a gamble if that was the plan, and the scribes were presumably either well-to-do or trusted by someone well-to-do if they could get their hands on the raw materials. That makes the prank/con/crazy spirit writing theory seem less likely to me but certainly doesn't rule either out.