Fireworks not working properly

When fireworks get to explode, they expldoe in different ways: I create a lot of Big Ball Fireworks and I launch them (like I left click the mouse and I launch 20-30 of them); the problem's here.. Only the last four or maybe five of them seem to explode correctly, the other ones disappear as soon as the next fireworks explode. So for example If I fire 10 fireworks, the first firework disappears as soon as the second explodes. It goes on like that until the last 4-5 fires, which last correctly and don't disappear.