77 C5 - Is it supposed to be wobbly?

I installed my new 77" C5 today and I notice if I touch the screen, the screen wobbles. This is quite concerning. My old C1 was more stable than this. (It is not wall mounted obviously)

Did I not screw it in right, or is this normal? I'm very afraid the TV will tip over.

If I don't touch it, it is fine. But if I touch the screen, especially the top part, it wobbles quite a bit.