Depends on what about it seems wrong. Do you disagree that you should one-box if you see that box B is empty? It's unintuitive, but it's the strategy that UDT stratightforwardly yields and that you would want to precommit to. Here's one bit of intuition: by being the kind of person that one-boxes even with an empty box, you force Omega to never give you an empty box, on pain of being wrong. Maybe these are relevant too.
Ok, it's like CM: right now (before Omega shows up) I want to be the kind of person who always one-boxes even if the box is empty, so that I'll never get an empty box. That is the rational and correct choice now.
This is not, however, the same thing as saying that the rational choice for someone staring at an empty B box is to one-box. It's a scenario that will never materialise if you don't screw up, but if you take it as the hypothesis that you do find yourself in that scenario (because, for example, you weren't rational before meeting Omega, but became p...
Here's an edited version of a puzzle from the book "Chuck Klosterman four" by Chuck Klosterman.
When should you punish someone for a crime they will commit in the future? Discuss.