ACR Tiling is not using the same size as requested

[focusedmotion]

I'm using a 23" Acer Monitor for my tables.

When setting up for 12 tables on this monitor, I use the sizing that WPN (ACR) has for 12 tables which look like this:

https://gyazo.com/899cdc9723544321e76c678d16ef79ef

However, when I implemented the Stack N Tile Layout for the exact sizing it ends up looking like this:

https://gyazo.com/da7915d71045e5015862997894eca8af

I made sure that I did the Stack N Tile sizing capture on the Acer monitor and that the auto select table option on ACR was unchecked.

How do I fix it so that the Stack N Tile layout will be the correct sizing?

Thanks for your assistance in advance.

Cheers,

John