Human flame fx not working correctly (Help, Help)

I am using fx human flame small & x small in a custom map. My problem is that they aren’t consistent in coming on in forge or customs. I’ve tried them straight from the menu and I’ve also scripted them with a delay to come on after the map has started with no luck. I can spawn them in forge, save the file and quit. I come back in forge or customs and about half of them has flamed out and are not working. It varies as to which ones work or not. I sure could use some help if someone else has had this problem. Thank you very much in advance.