Do you, by any chance, have some customization add-on installed, such as Stylish? If so, that might be interfering with PC's layout design; I'd recommend you to disable all your style-sheets one-by-one (or the plugin itself), and see if that works. If you have AdBlock (or anything else of the like), you should try turning them off, too, if you could. If none of this works, you're always free to go ahead and re-enable them. I hope this helps!