'P' is the key

[eggyk]

The MAP (the thing with the land and sea) is 22x19cm, on a sheet of VELLUM sized 29cm x 41cm. 

Yes, so I don't know why you would keep editing the labels in your photos to show 29cm, when the vellum measures 22cm. Again, in vellum to vellum comparison, this leaves only a 1.5cm difference..I don't understand why you would keep measuring vellum to sheet. It does not make sense. 

I'm going to make one last image, but its clear that you're doing this deliberately or using an LLM with memory loss. You cannot possibly not understand what i'm saying. 

The vellum is 29x41cm, and on that vellum is a map of size 22cmx19cm. 

   

failed to mention the difference in measurement between sheet size and and vellum size, in addition to attributing the vellum size to sheet size. This seems to have been intentional because.. obviously you knew the sheet measurements and vellum size,

The sheet size is the sheet of vellum. The vellum size IS the sheet size, because it's a sheet of vellum. So yes, it's intentional because it's correct.

The vellum is not 22x19cm, because its clear to see that the sides do not have that ratio. 

Perhaps the people on reddit were onto something.