Currently a lot of our newer features in UI use CSS Grid to layout grids/tables. However, some older browsers don't support this, leading to broken UI.
E.g. CSS Grid is only implemented in Safari 11, which only comes by default in macOS High Sierra. If the user uses an older OSX version (e.g. macOS Sierra or OSX El Capitan) and haven't updated their OS yet, some features in UI will be broken.