Why I think that the copyist(s)/scribe(s) did not fully understand the material

[BessAgritianin]

It is plausible, that the Voynich Manuscript in its present form is a copy, or composite compilation of different scribers.
In middle ages a system of  fast copying known as "pecia" was very popular (citation):

"The Pecia system was a revolutionary manuscript production method developed in medieval universities (13th-15th centuries) where authorized texts were broken into smaller, numbered sections (called peciae, or pieces) and rented out by stationers to scribes for copying."

Evidences for Voynich of being a product of this system are:

1. Different handwritings
   
2. Mixed foil numbers
   
3. Different stain patches which do not sit with one another if the foils were together
   

Giving these observations- where might be the original?