I can get in car first time but when i second time enter car, my character and current car is fly away on map and jittered on sky. btw when i into exit car animation car is start jitter and i out car i try go walking away from car and again try enter car every second try my car is flying. And when I tried it on another car after entering and exiting the current car, the same error occurred, so the problem most likely may not be related to the car.
Can you post code/BP associated with entering the car?