My Shed Base not Level

[saadinov]

Hi
I have just built a base for my shed with slabs and small layer of sand and cement mix. Unfortunatly the base was not very well made so the slabs are uneven.when the shed came they erected it on that base.
So the floor is a little loose in the middle of the shed and there is a small tilt . What problems should I expect if I leave it like this ? any way to reenforce it without dismantling it?
Thank you for your help.
SE