doing a market buy instead of limit order

i am eager to do a limit order for a brief however it keeps on doing a market order brief, the worth of my order and the place it's, is a 3% distinction. is it not sufficient? i am underneath the limit faucet im putting in the worth i am wanting the order to return in however it shorts it instantly three$ above my restrict order, im guessing im doing one thing incorrect, can anyone assist me please google isnt serving to at all