Help texting problems on milestone- HELP

[flomzilla]

i got the milestone for my birthday, and love it, but now it has some issues. when i'm texting someone, they will send a message, and my phone will receive it over and over again. (a five message conversation turned into 164 messages overnite) someone please help me.

 

[TelusMilestone]

Never seen it that drastic. Might be the carrier but hard to say. So your using the stock messaging app?