Main and Additional Image Popups wrong size image

When I click on my main product image or the additional images the popup window is showing the small-sized image instead of large. When I right-click->copy image location on the image in the popup window, and paste it into the address bar the correctly sized image is shown. The source in the popup shows img width="150" height="200" and I am not sure where it is getting this from.

I have tried this on the default template and get the same result.

Any ideas of why this might be happening?

It looks like it's getting the information here:

Admin -> Configuration -> Images

Do you get the desired results if you make changes here?

I guess I'm confused on how this is supposed to work. Isn't the popup supposed to pop up the large product image? I need the product listing, aka, small images to be 150x200.

I made the changes you suggested and does seem to fix the issue. Very confusing as it's labeled small image width/height, but is for large images.

Thank you! I never would have figured that out.

Glad to point you in the right direction :)