That is not normal. Either something is not tight or....? First check that your stem is tight in the frame, big bolt on top.
If this does not work then take the bike into a bike shop and have them look at it. If your handlebars turn and your fork doesn't then you are in danger of some serious injury. The two (must) turn together for proper safe operation of the bicycle
Answers & Comments
That is not normal. Either something is not tight or....? First check that your stem is tight in the frame, big bolt on top.
If this does not work then take the bike into a bike shop and have them look at it. If your handlebars turn and your fork doesn't then you are in danger of some serious injury. The two (must) turn together for proper safe operation of the bicycle