What's wrong here?

Scalewreck

As you can see, the precondition asks if the new password is similar to the old password. In the run and debug it's different but, it's still being found as the same thing.
There are no other preconditions that relate to both the new password and the old password.
I'm not sure what's wrong.

Ray Deck

The precondition means the reverse of what you are saying here. The precondition passes (e.g. no error message) if the condition is true. It throws that error if the condition is false. SIcne the inputs are not the same, the condition is false, which throws the error message.