Yup it happened to me once after plugging tuneecu in. Mileage went from around 20k to 111000k. I just made a note of the reading before and after so I could keep track of the real mileage in the future.
anyways welcome, all things can be overcome, tell us more about yourself and become one of the Captains on the forum. Many great people with lots of knowledge about the rocket. Someone will chime in, the numbers you show, can't be just miles to km, it's off by a factor of 10, km would be like 25000 or so.
Thanks for your input. Think the problem occurred when the garage couldn't start the bike and jump started it. Found a couple of 'companies' that will reset it for £80....