Text message issue with more than 160 characters

I have a Bold 9650 on Sprint. With the latest Sprint pushed software OS upgrade, I have the ability to type beyond the 160 characters for up to what appears to be 7 text messages worth of characters. If I send a text message that bleeds over into the 2 of 7 text messages (over 160 chars), only the second part of the text message arrives to the other person. It also happens if I send the message to myself. Any suggestions or anyone experiencing this issue?

with OS 6 anything over 160 char automatically gets sent as MMS. Sending of MMS message could be your problem.