How to add unique dimensions for each art piece?

[Ancientart]

Hey guys, my goal is to sell original artwork and they are all different sizes. When i add dimensions under one piece of art, it automatically fills in the dimensions for the rest of the art pieces. How can i add different dimensions per art piece without it automatically making them the same?

[Lucid_Polygon]

• Where are you adding dimensions?
• Which theme are you using?
• Please include screenshots

[Ancientart]

I am using Dawn, and here is my screenshot, i am adding dimensions under my painting.