I found little bug with sticky bombs. The can "fly".
If you stick sticky bomb to moving object (train, container, ...), the sticky bomb is on one place, but object is gone. Thats why they fly.
It works only with objects that are coded to move, that means no boxes, barels and anything affected by physics.
That mustnt be fixed by coding, just little bit change texture, add to it some thruster or something else.