Help Double sms tones with Handcent sms


I know this has been asked, but it still hasn't been ANSWERED right lol. Or maybe just not asked right, idk...haha
anyways, i have disabled the default sms and and everything, and everytime i get a text message, it plays my ringtone for Handcent sms for about one second then cuts out and "ding"s. i've even put the default sms on silent, and disabled it, EVERYTHING!! so i have no idea what it is but i'm about ready to return the phone because this is crap lol