Skirmish mode : why I never user ground units or VTOLs

[pmat]

Perhaps confused, but if I order them twice to go to the same location, they should continue their way as before

[SCAVANGER]

yeap i have sometimes this problem too when i order to go to a site of the map that is higher the units think they can climb?? and get stuck and makes a lot of traffic jam and when i see the map there is a huge space when they can pass nut they still think they can climb and some units dont go up and lost of the commander range