United States
Are we playing different games?
We must be because I have all of the same issues thekingsown10 has
Some days I have more lag than others and when I do my vehicles go where ever they want almost like I am watching someone else play the game. I attribute the different scenarios to:
- Network lag. Long lag means your vehicle is somewhere else when it gets your commands.
- Seems like you click behind a vehicle and it may back up. Click again and it tries to turn around. As InsaneHoshi said try to only click once or use the backup key. Clicking behind a vehicle is no guarantee it will back up.
- As A.Soldier refers to, COH2 has more elegant code for vehicles and units. They try to get out of each others way in a realistic manner, as opposed to glitching/phasing thru each other. Sometimes the moving may conflict with what you are trying to do.
I do not know what causes the MG pointing the wrong way bug. I see it the most on units that I send a fair distance to setup. My guess is something blocked them from getting to the desired setup position so they just drop where they are when they get "lost". Or perhaps the command did not make it from server to host in time (lag) so they just stop and drop.
Both of these things are game changing when they happen. Try to notice more of what is going on around the unit and where exactly did you click. Did your mouse double click? Did you have lag? Was another unit coming thru the area at the same time?
Lion king
Private Mok
Relic Entertainment
보드카 중대 
Heartless Jäger 
