At some point while editing the theme, I noticed that the preview looked a bit strange... The "main content" started only loading beneath the sidebar.
There's multiple people working on this site so nobody knows what exactly happened.
Does anyone know what might be the problem? Is it salvageable without a reset?
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I don't know if it's part of the theme or not. But get rid of the display: table css in the grid and the below picture is the end result. Who knows what they changed, If the grid is apart of the theme then someone definitely changed something in the CSS or adding something. Nonetheless, what is happening with this site? Looks extremely unpolished.
This is an accepted solution.
I went to start another trial to get access to unedited Simple Theme code without resetting this entire store.
Replacing header.liquid did not help, but replacing sidebar.liquid did. I will gather the "features" from my colleagues and personally add them back in with checks this time.
I'm sorry I cannot really help others facing this issue since I could not pinpoint the error, but I hope this would be a good compromise between regaining functionality and nuking/restarting the site.