There are adjustments, they are the position of the arm mount to the base of the awning. The distance from the mount of front and back arm to the end of the tube should be the same; if not you get the scenario you have.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7