Is it normal for the Lancer to feel a bit unstable at 120 km/h?

There were four people in the car, all weighing 180, and nothing happened.

I drove at 160 km/h [I want some peace and quiet]

Does it float at 120? I drove at 170, and it was pretty stable, much more stable than another domestic car at 130.

There's something wrong. This car should handle 180 without issues. Check the tires, do a wheel balance, alignment, and camber adjustment.

That's right, because the car is lightweight. My previous one was like that too.