I have a RetraxPro MX on my 2018 and my 2022 - stake pockets are completely covered on both and my rails are parallel.
There is an optical illusion if you look at the outside edges of the rails because they are contoured/tapered to follow the exterior bed rail.
Measure the distance between the rails in front of the canister, at the front clamp and at the rear clamp. Compare the measurements at the clamps to the measurement in front of the canister. Adjust the clamps and nylon set screws to adjust to the rails and make the distance between the rails at above the front and rear clamps the same.