...nah dude, don't worry about it, pretty normal actually. All kites get this and usually when they get slightly older. If you think about it logically, there is alot of force and eventually things stretch a bit (very small bit) and those tiny little holes from the sewing become ever so slightly bigger and light has the ability to spread out the light and look bigger than it actually is. Imagine this, your flying at 20,000 feet at night time and you see a lone light on the ground. It looks so obvious to you and yet if you see the same thing in the day, you probably won't see it. That small little element in the bulb can look so big from a distance and if you think about it, it's still a small thing dispite what you see.
Anyway, don't worry about it.
Robbie