HP LJ 6MP going to wrong tray.

I have users on a networked 6mp that when they print, they go to the wrong tray. I have the default tray set to “2” (bottom) on their PCs and no matter what, it wants to pull from the top. Am I missing something. I know the app they’re printing out of isn’t setting the tray. Also, is there a PCL6 driver for this printer?