fixes #5907

issue caused by relaymove() not being checked properly.
added comment to prevent this kind of issue in the future.

code/game/atoms.dm

@@ -200,6 +200,8 @@ its easier to just keep the beam vertical.
 	//usr << "[name]: Dn:[density] dir:[dir] cont:[contents] icon:[icon] is:[icon_state] loc:[loc]"
 	return
 
+// called by mobs when e.g. having the atom as their machine, pulledby, loc (AKA mob being inside the atom) or buckled var set.
+// see code/modules/mob/mob_movement.dm for more.
 /atom/proc/relaymove()
 	return
 

code/modules/recycling/disposal.dm

@@ -190,7 +190,8 @@
 /obj/machinery/disposal/relaymove(mob/user as mob)
 	if(user.stat || src.flushing)
 		return
-	src.go_out(user)
+	if(user.loc == src)
+		src.go_out(user)
 	return
 
 // leave the disposal