I assume this is a technical issue? Unless there is a reason that V and H art has different prices for the same size?
Canvas Art different prices between vertical and horizontal 24 x 16 sizes with the same percentage markup.
https://www.zazzle.com/vincent_van_gogh_wild_roses_canvas_print-192652097200021523
https://www.zazzle.com/vincent_van_gogh_roses_and_beetle_canvas_print-192320019223591857
I just played with the size on the link you provided. As far as I can tell, the price is $100.00 for both the horizontal and vertical 16 x 24” canvases. Maybe it was a temporary glitch.
I figured it out!!
The horizontal canvas was “custom” 24x16 … I must have entered the size manually instead of choosing the 24x16 option.
When I choose the 24x16 option the price dropped down to $125.
Mystery solved! Phew! That was weird. Hopefully I do not have a bunch of these, it would be impossible to find them.