94 S500 Windows Shot, Only Shattered

[sulman2703]

Some nuckle head kids shot either a pellet gun, bb, or .22 at my drivers front window on my 94 s500. The outer glass shatterred, yet the inner was untouched. When i got the new glass put in, i started noticing a hissing sound as i drove down the highway. I noticed that on the outside, the glass is not totally flush with the door molding that is just perpendicular to the door handle. I took it back to the place and the guy said the channel was shifted and he reglued/polyurethaned it back into place. A week later, my window shifted again and the guy today is saying i might need a new window regulator. What do you guys think the problem is? What exactly is a regulator? Another characteristic is that when the window is halfway down, i can manually move it back and forth and shift it back to its proper sealed position, yet when i roll the window down and it comes back up it shifts maybe half a cm forward again...Please advise.