Height of custom artwork in Artwork Showcase uneven

[Teero]

I want to add a second image next to the one I have on my Artwork Showcase right now. I already know how to upload it as a long picture but it always turns out a bit longer than the main one. Here are the sizes of the images:

Main: 1024 x 576
Second (uneven with the main one when uploaded): 197 x 638

Resizing the second image to the same pixel height as the main one doesn't work, I already tried that.

[MoonC A T]

ok the issue is that the main should be 506 wide and the side should be 100

if you resize both to that width then set the length, it will work

if you give me your artwork via imgur I can resize it for you