Everyone's muscles are not completely symmetrical. Generally, the left and right forces are different. You use the same weight in your daily life and sports. However, the left and right muscles are stimulated to varying degrees, resulting in different sizes. Generally, we correct it through exercise, that is, we practice more in weak parts. It's simple. It's small over there. Push harder over there. There are push-ups and barbell bench presses. Or a dumbbell bird. Your sequence can be practiced from the top of your chest, that is, find a sloping plate to press.