Item Sets bug for Mac Client...

Video of bug here: https://youtu.be/Xrt9Dz_E2UM

The items sets for the Mac client has one specific issue for a couple patches now: I can can REMOVE items from my item sets, but I cannot change or add items to my item sets. In the past it was a great way to save time and focus more on the game, but with this bug me not being able to change my items outside of the game is kind of annoying.

Additionally, it did not go away when I close the client, went to the launcher, and tried the "debugging" option.

Can I get someone from riot to look into this? Really would appreciate it! <3

-Dan

Edit: Video attached above ^