Rectangular Pixels in blender

I noticed that my pixels stretch with the resolution of my image. If I render a 1080x1080 image, the pixels will be 1:1. If I render 1920x1080, the pixels will be 16:9. Is there any way to have square pixels in the 1920x1080 image and does anyone else have this issue?

I found a solution, if anyone suffering from this encounters the same problem, reset all preferences to factory startup.