It has to do with how events work.
Event 8 will be tested every tick and will execute each time it is true.
So since you're changing the value of time only once every 0.01 second that renders the event 8 true twice in a row, hence playing twice the sound.
To correct it add a system condition "Trigger once while true".
It's about the same for event 9, but you may have to split it into two events to have the second shoot also happening.
Finally you might want to also look into the "Timer" behavior.
Also a note for the next time you ask for help it might be easier to provide your capx rather than a video of the issue, since it allows us to look directly in the code and potentially provide a corrected capx back. Attach it to your post.
Thanks so much, it appears to be working right now! I am really glad it was a simple fix. But without your help I probably would not have thought of it.
The reason I posted a video was because I thought it would be helpful to SEE the bug, since it doesn't always happen very often when I play the game. I thought between that and the screenshots it would be enough. And since you were able to help me, it seems like it was.