For some reason the AC2300 model number is not available above, so I had to select another model. 

This is a new router purchased about a week ago and I had no problems initially setting up the old Wi-Fi password, but decided it would be a good idea to change this today. When I edited it and pressed the save button it all seems correct and a pop up says saved, however all my devices remain online. After logging out and logging in it is clear the old password is still in place.

Is there some way to fix this?