There are many instances where the default is set at enable fnurbifucation with white text on a black background. Disable is shown as black text on a white background. When you change the state the text and background color inverts.

There is no way of knowing for certain what position is on and what is off without assuming that the first displayed state is on.

I believe recently I setup a nest with this issue. There is no way of knowing what is specifically selected unless there are three options. With three exclusive options you can compare to determine what the current state is because two of them will look the same thus must be off.

Ti-89 93... calculator settings can have this issue but some of the options have 3+ states and once you see the schema it's quite easy to deal with.