My left chest is more developed than my right chest. How can I fix

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I'm a boxer and my right PEC is larger than my left, although my left PEC goes down further. Also, my right serratus is less developed than the left. Why is that

When flexing my pecs, one seems to have more skin than the other and makes my chest look uneven but only when flexing, how can this be fixed? I weightlift most days.