Try taking the servo horn off of the servo. Power everything up, make sure the servo works back and forth. Confirm the steering trim on the radio is centered. Then reattach the servo horn with centered steering with the servo centered. Start it on the servo, then shut the RC off to finish pushing it on, install screw, etc. Common issue, need to power up the servo to get it centered before hooking it up in the RC, at least that's my guess, hope that is all it is.