Conveyors can only have their movedir set to 2 in away missions.

[WJohn]

Fairly self-explanatory. Normally on the station, creating a conveyor and setting its direction (dir) will cause items to start moving in the direction (movedir). In away missions this is not the case, as conveyors that I have set to 4 (east) instead have a movedir of 2, even if they are literally copy pasted from the station and only have an ID change.

Movedir is not a variable normally set in the map maker as no conveyor piece uses it. It's generated when the game starts. It will be reset from whatever you edit it to if the lever is flipped.

Station:
http://i.imgur.com/9ezZMUR.png
Away mission:
http://i.imgur.com/cYA2zMh.png

[RemieRichards]

I don't even see how this is possible:

/obj/machinery/conveyor/New(loc, newdir)
    ..(loc)
    if(newdir)
        dir = newdir
    switch(dir)
        if(NORTH)
            forwards = NORTH
            backwards = SOUTH
        if(SOUTH)
            forwards = SOUTH
            backwards = NORTH
        if(EAST)
            forwards = EAST
            backwards = WEST
        if(WEST)
            forwards = WEST
            backwards = EAST
        if(NORTHEAST)
            forwards = EAST
            backwards = SOUTH
        if(NORTHWEST)
            forwards = SOUTH
            backwards = WEST
        if(SOUTHEAST)
            forwards = NORTH
            backwards = EAST
        if(SOUTHWEST)
            forwards = WEST
            backwards = NORTH

/obj/machinery/conveyor/proc/setmove()
    if(operating == 1)
        movedir = forwards
    else
        movedir = backwards
    update()

[RemieRichards]

if you want to map edit it, map edit it using the proper vars

eg:

dir = NORTH
forward = NORTH
backwards = SOUTH