Preview distorted after render for each clip

Hello,
I am experiencing this weird effect and I have no idea what to do about it, googled like crazy but I can't find any solutions.
So whenever I import and edit a clip, everything looks smooth, fine, all good, see here.
However, once I render the selection the image gets distorted, it looks crushed and loses its aspect ratio. This happens for each clip with varying degrees of distortion.
Now I was theorizing that this is because I use PAR 1,2121 and the source footage is all sorts of different formats. 
However, when I actually export the full video it renders the way the preview looked when I edited and before I rendered the selection. 
Is there any way to render the selection and keep the individual clips from distorting? What's the cause of all this? Glad if anyone can help! My sequence settings are below, lemme know if there is anything else you need.