Try entering the type, then changing the name and hit enter, then if you want change the name and hit enter again. Sometimes changing the type doesn’t seem to dirty or commit and only once the name has changed does it pick up on this.
Brock is right, I get the same thing a lot and it’s a real pain if you don’t notice that it’s reverted back.
There is no fix, you just add what ever , hit enter, go to name and change it a bit and hit enter and back again. And do a little dance.
Worst case delete the property and remake it.