The example app at localhost:4242 is a WaterColorBot control example; it is not an API.
You can check whether the API is in AxiDraw mode by browsing to: http://localhost:4242/v1/settings/global .
If it is still in WaterColorBot mode (and the fact that it is drawing diagonally suggests that it is), then you still need to set the bot type variable via the API.
If you happen to be using the copy of cncserver embedded in RoboPaint, then you also have the option to go to Settings > Advanced and change the bot type there. (You will need to restart RoboPaint after restarting it.)
