Projectile destroying itself

I’m making a 2D side scrolling shooter and it seems that my projectiles expire at a certain point like there is an invisible floor collision. I’ve turned off collision of the projectile and made the projectile expiration infinite but the projectiles still get destroyed at a certain point on the z axis and I just can’t figure it out.
Am I missing something?

Check your world settings - I think it’s called Kill Z.
This specifies the Z value at which anything will be destroyed.

Edit: Yes, Window->World Settings, then check bottom right of screen under World->Kill Z.

awesome it works, thanks sooo much!