Not showing 2 GUI windows

Hello everyone, I’ve come across a problem with my GUI’s, it seems when I open 2 GUI.windows, they hide the other one. It sounds like I just have to move them, but it’s not the case, it literally won’t allow me to have 2 windows on the screen, even though I’ve used two windows before. I’ve tried to see if it’s because they’re on the same gameobject, but apparently not. From what I can tell, there’s nothing that is making them act as they are.

It’s my Inventory and shop windows that are the culprits. I’m trying to make a shop window that has the inventory next to it, so the player can see what items they have in their inventory and so they can sell them.

Here’s the shop(I’ve used pastebin because the Unity website didn’t want to let me use the code annotations):

And here’s the Inventory (This one’s very long):

Here’s also a video of what’s happening:

Any solution would be greatly appreciated!

Looks to me, from your video, that your shop window is too big