Bomb flies across screen at start of layout

When I test my game a bomb flies across the bottom of the screen. I have the bomb well off the bottom of the layout. How can I get rid of that bomb until my tank creates it?

Thanks for any help.

+On start of layout

>Bomb Destroy

alternatively, place one instance of each object into a separate layout simply called 'all objects' that way you don't need any in a game level layout.

Give it a destroy outside layout behavior?

I would have an image point on the tank for the bomb to spawn at. Then upon pressing something such as the [spacebar] the bomb will be created. Also give it bullet movement to ensure it goes forward.