Gymnastic Bmi If You Are Muscular Will It Effect Your BMI?

If you are muscular will it effect your BMI? - gymnastic bmi

I could see a little, when I go to check my weight and my BMI says I am a little overweight, and some say I'm not on weight and I am normal and if you have any links that ask, and I am muscular Type-I gymnastics with my boyfriend, sometimes not (in an official class, which shows me things tighten your thighs) and I have some muscles in the arm that my BMI would affect