wHY IS IT SpawniNG multiIPLE OBJects WheN ITS SuppoSE T0 Spawn oNe?

it making a game that is a simple boss fight game i'm trying to make a fireball attack but the boss shoots a beam of fire balls instead of firing 1

If you are using "Is key down" keyboard event or "Is mouse button down", it's triggered many times per second. Replace it with "On key pressed"

no the boss I spawning multiple bullets instead of just one

{"is-c3-clipboard-data":true,"type":"events","items":[{"eventType":"block","conditions":[{"id":"compare-instance-variable","objectClass":"boss","parameters":{"instance-variable":"attack","comparison":0,"value":"1"}}],"actions":[{"id":"set-position","objectClass":"boss","parameters":{"x":"attack1.x","y":"attack1.Y"}},{"id":"set-animation","objectClass":"boss","parameters":{"animation":"\"attack\"","from":"beginning"}},{"id":"set-animation","objectClass":"boss","parameters":{"animation":"\"idol\"","from":"beginning"}},{"id":"spawn-another-object","objectClass":"bulletSpawner","parameters":{"object":"fireball","layer":"0","image-point":"1","create-hierarchy":false}},{"id":"wait","objectClass":"System","parameters":{"seconds":"3"}},{"id":"destroy","objectClass":"fireball"},{"id":"set-instvar-value","objectClass":"boss","parameters":{"instance-variable":"attack","value":"choose(2,3)"}}]}]}

here is my code I don't know why its bugging out

I think you need add sub event inside the condition: System: Trigger once