Forget the weird, just drop it, it's not weird at all, you are a habitual train fare scammer and the person entering the data isn't the idiot you took them for.
Your position is immensely strengthened if you pay the fine (which is legitimate, whatever name it is in) promptly.
Once the fine is paid, the only outstanding issue is the false name you gave. With the fine paid, their only reason to pursue this issue is if they decide you are a habitual defrauder (which you clearly are and they know because their records are clearly stronger than you thought) and they have to decide if it is worth pursuing you over that matter. If you still have an outstanding fine at this point, they probably will, if you don't, they might decide not to bother (or you wait until they have a couple of examples when you are over 18 and then really go for you!)