Hard to say anything since I haven't encountered such a bug myself, despite playing dozens of base defenses. Not a single instance of an enemy spawning in the wrong place, or getting 'stuck', or 'idle', whatever that means. I've even rechecked every map recently to see if there are no wrong node definitions, nada. So I'm highly skeptical about your claims - a proof (saved game) would help. Are you sure you have installed the mod properly? Are you sure you're not using any clashing mods? Is the vanilla OXCom working for you properly?