Hi Jim,
is it possible for you to provide screenshots?
I can't think what would affect the icons that way.. Have you checked for malware? If not try this app:
https://www.malwarebytes.org/
Does it coincide with anything you may be doing on the system?
Does your screen Tiles look like this after rearranging themselves or similar?
http://lifehacker.com/restore-the-windows-start-screen-to-its-default-layout-1500431589
Does it happen with just that site or any other also are any new icons added?Go to FedEx package tracking site. Click in the window where you enter the tracking number. Exit Google Chrome. The icons are changed! That is it. You don't even have to enter a tracking number, just click on the window.
One other condition is necessary. The on screen keyboard must pop up. (This is just for Desktop icons, not the Start Screen Tiles.) I haven't seen the tile thing again. Maybe I just did a change and din't realize it. I haven't checked any other site yet. Will try UPS.
Jim
Jim can you post the make and model of your machine please. Also have ever used a registry cleaner or things of that nature?