1. The way the level is determined of an evolved Moga works by calculating the mean or the average of the levels of the mogas your using to evolve. So in this case, most of the mogas you used to evolve were level 1. However if you calculated that the average isnt 1, then its a glitch and you should send a ticket.
2. The tutorial at the beginning pretty much explains the basic mechanics of the game. If you need more info, there is the forums.