Not sure if I've put this in the right place, but just wondering if anyone else has this pram?

Recently I've noticed that when the front wheel isn't in the locked position, it wobbles and kinda bounces while I am walking? If I have it locked so that it stays straight it is fine. I remember reading in the manual if you are running with it to lock the front wheel, but I wouldnt have thought I should have to when I am walking?

has anyone else noticed this?