Why does twitter not show my full followers count?


hello i’m a up & coming deejay & producer, youtuber etc i have a following but i’ve also been noticing that when i @ someone i cant see their names pop up
or im following people i never followed 2) im suppose to have over 30 thousand followers but twitter only shows 3,000 i can see 36 thousand on this online twitter tool but not on my account is their a limit to how many followers a certain person should have or is it because im not following enough people and the ratio is unbalanced HELP !! lol thank you for your time