Certain programs on my taskbar stay with their allocated icon

Why won't certain programs on my taskbar stay with their allocated icon? I have 5 nice, neat icons (Steam, Skype, iTunes, uTorrent, and Crome) on my taskbar, and nothing else. Skype and iTunes, however, do not stay with their allocated icon like the rest of the programs do (see pictures). I know it's not really a big deal, but it semi- bothers me and would be nice if it could be fixed. I couldn't find the right words to find it on google, so I apologize if it's not an appropriate question to ask here.

Any help would be appreciated.



I seem to be having troubles uploading the pictures for one reason or another, so I uploaded them to imgur instead:
1: https://i.imgur.com/kGWG9QH.png
2: https://i.imgur.com/lW59olH.jpg
3: https://i.imgur.com/5mIxyZr.jpg

whs said:

Try this: Icon Cache - Rebuild

Nope, I did it but to no avail. I don't believe the icons themselves that are corrupted.

Thanks anyway.

Bongo said:

Pin the open ones and unpin the ones that don't change.

Jerry

Wow, that worked. Thanks.