Buxus sempervirens leaf size

[TuckerBesosa]

Hello everyone, I was wondering if anyone could tell me why my common box (Buxus sempervirens) has two different leaf sizes?
Also what I should do to fix it.

Thanks

 

[BrianBay9]

Most trees will have variable leaf size based on growth rate, sunlight, water. It's not unusual to find different sizes on the same tree.....with some trees even different shapes.