So, I was messing around in the game and noticed a bug with my T500RS + TH8A, I can increment the throttle fine when increasing but to decrease the throttle I need to release it then increment it to the desired throttle instead of just reducing the throttle.
Hardware: T500RS Wheel + TH8A Shifter
Mode: Manual with Shifter and Clutch.
For Example: If I am at 80% throttle and need to drop to 50%, I need to release the pedal fully then depress the pedal to 50%.