need help wit ringtone! (when certain people call me the volume turns real low)

I recently got the samsung t439 and im liking it so far.
I added my custom ringtone and it works good....except.....

when a certain person calls me, u can barely hear the ringtone. The volume is almost at off. But if u put ur ear to the phone u hear the ringtone.

And then when somebody else calls me the the ringtone volume is back to normal.

Why is it like that??

I aint sure but im thinking that it has to do with my fave 5??
Because i put my "house" as a top five and when everytime somebody call me from it, i can never hear it because the ringtone volume sounds real low.

But as soon as somebody else who is not on my fave 5 calls me, the volume is back to normal. why??

And its not the volume because its always at its highest and i always check it to make sure. Its something else.

Can someone help me???

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can anyone help me please?