Multiple Spawning Trigger Problem for TD

[Desolatefire]

ok me and my team are making a TD and we have the Paths all triged out so the unit runs it correctly. We are making a td based off income where u may all well know you spawn the cretures that run an oponents path. Well when we spawn a creture one runs the path like it should and another one spawns (clueless on why) next to the building the creatures are spawned from. PLZ HELP if ur a pro a making tds i would very well appreciate it.