Why does my actor with projectile movement delete it's self when "Initial Speed" is greater than 0.0 but it's "Max Speed" is 0.0

I have attempted to create a projectile for a game. When spawned the projectile deletes it’s self after a short time (aprox 1sec). This seems to occur when the "projectile movement"component has an “initial speed” greater than 0.0 and a “Max Speed” of 0.0 . When I set the “max speed” to any thing greater than 0.0 the projectile persists as expected.