Well yeah, it prompts you with a warning that your curse will be removed if you do that action. You're supposed to save your current build to one of the slots if you have Werewolf or Vampire active in your build so you can return to it. The design is that players can obtain both in two separate builds.
Thanks. I loaded a blank slate on a few characters and never noticed that warning after reading it a few times. I just tried it on a second vampire toon and then saw the warning at the bottom.
A red highlight would be nice to call attention to text changes, I would not expect players to read the warning after the first couple of times.