If the light fixture itself is humming, try disconnecting the lights in the base, one at a time,to see if the problem is in just one of them.
Make sure they are all snugly connected to the base.
Or you might return the track lighting as defective. It's possible that a replacement wouldn't have this problem, or that a higher-quality unit wouldn't have this problem.
By the way, do did confirm it was wired correctly and that the bulbs used weren't in excess of the unit's rated capacity, right?