I have noticed that for some reason certain sites are not rendered/displayed correctly, I've tested this on browsers like Opera 12, Firefox and Vivaldi. Can you guys perhaps check if you see the same? https://www.ghacks.net/ http://www.fcupdate.nl/ https://www.4kdownload.com/
Thanks for checking guys, but I feel like an idiot. It was probably caused because I blocked a certain domain name with SpyShelter. I can't believe that I didn't figure this out weeks ago. It's probably best to leave the tracking-blocking to extensions.