Office 365 icons

So I was just minding my own business and watching youtube when I saw a Microsoft auto-update pop up, no biggie, I thought and I kept on doing what I was doing after the update had finished I noticed that my icons had changed, but not my teams and word icon for some reason, does anyone have a reasonable explanation for this? and can I change the word and teams icon as well. I know I can do get info and copy and paste an image/icon that way but I learned that after a while the icons disappear and I have to change it again, i want to change it permanently. also i dont know if you can see it or not but if not you might have to scroll down to see the full image