alto is playing up an octave

Hi! so ive been playing the alto saxophone for about three and a half years(im only in 8th grade), and when ever i try playing a low F,f#,e,d# it plays up an octave. As if im using my register key. and i just had it repaired about a week or two ago for some minor adjusments, and it didn't start doing it until after i got it back. So i took it in again  and they no problems with it, but i stiil do. i should also add if start out playing on one of those lower notes i can go to a C,A,B. orG and it will sitll play up an octave and im playing on a vandoren 3-1/2

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