Spawn point bug

I set my world spawn in a PvP map I'm making (and it is still private because I'm not finished so I haven't let anyone in the world) but when I die testing it I'm teleported to some random location when I die, and the location is different every time. I've been constantly setting the world spawn to where I want it to be but no matter what I keep getting spawned in a random  location. I made sure it wasn't my command blocks by accident, but it wasn't.