Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the treadmill. Additionally, please provide clear closeup pictures of the "...looks like the The incline motor brackets are bent..." Click HERE.
Still, agree with the incline motor running, then it would most likely be an issue with the gear not engaging/meshing.
...and the possible bent brackets has moved the motor a bit further away.