Weird. I'm playing the GOG version and they moved. I had a problem later in that level where I didn't trigger the guy on the radio telling me where to go and then he'd say "sorry chico", and plop I'd die. I restarted a few times and it finally worked. I think events are triggered at very specific points in space. Try moving around to slightly different locations.
Remember to quicksave often.
I think I'm at the "2nd phase" of this ridiculously difficult sneaking-through-the-Watergate level. I'm at this point where there is a ladder and a guard standing on a stairwell. The guard doesn't move at all and whenever I go a different direction the player dies. If I try to move past the guard the player dies as well. Is this a glitch?
Update: I think I finally figured it out. It looks like I went through a wrong door and the game didn't script properly.