Only the first bullet flies away from the character
Run the project in Debug Mode (Shift+F4). After firing a second bullet pause the preview and then find the bullet in the list of objects on the left. Check how many instances of the bullet are there, check their properties. Maybe the new bullet is invisible, or on a wrong layer, or has wrong coordinates etc.
Debug Mode is a super useful tool for troubleshooting. If it doesn't help, consider posting your project file.