Our guy didn't post the exact cause of the problem just a generic solution.

An issue like this is usually caused by too much front toe in / out. What happens is the car is plowing down the road more or less straight. When one tire breaks traction ( like over a bump ) that tire slides in the direction of the tire with good traction. Too much toe out, RF breaks traction , car slides to the left.

The feeling is that the car is gently wandering or squirming down the road. I recently rented a truck and driving off the lot had this feeling. Checked toe at home and found it to be over 1 inch in, adjusted it to sub 1/8" in and it drove much better..

While we are on the subject, a stuck ball joint will give a harsh snappy " can't keep the car straight " feeling. This is because too much steering friction won't allow the wheels to find natural center. Turn the wheel a bit the steering unsticks, the wheels steer too much then stick, steer them back and the same problem occurs over and over.