why do the devices like joystick and throttle are changing their joystick number and need fix&rebuild？

im using unity flight simulation engine to test my warthog joystick/throttle/peddal

and im using a usbhub

but if i unplug them and replug them, their input joystick number are changed and i need to try out what joystick they are controlling and modify them before rebuilding.

can i get something like hardware id to specify what to control?