I've recently tried updating Statamic from 2.7.2 to 2.11.20 and the entire site seems to have scaled up (font size, images, etc).
I've also tried looking at the live preview on our page from the control panel and it looks normal. However, it doesn't reflect what I'm seeing on our live site.
Is this a known issue for updating? Or is there something wrong with the coding in our CSS file?