Strange bug with randomness

In this wee exercise, I've noticed if numerous fireballs hit the alien at the same time, some of the explosions appear in the top left corner rather than at the position of the alien plus a random perturbation. You can see this for yourself if you accelerate towards the alien firing.

Anyone have an idea why this is happening? And any clue how to fix it?

WSAD to move, left click to fire fireballs.

Here

The alien sprite's "hit" animation doesn't have an image point defined, so it defaults to 0,0.

^ tested, and it worked

Thanks Rojohound. It's always the simplest things eh? Good to know as well that the image point isn't automatically created, like in MMF