Problem-Texts going to Facebook !!??

So This has happened more than once now and its really bothering me...
I send a text (response) to someone and whilst the phone shows that i sent it to the intended person I realize later that they didn't actually get it at all. and instead that message is somewhere in Facebook.
A couple times its been in a private message (to random friend) and sometimes its ened up in someones (not the person I was texting) status!!!!????
This is worrying -as you can imagine. I don't get why its doing this and its not Fat fingering in any way as I usually don't have the threads up...and the phone indicates that I HAVE sent it to the person it was intended for
I use HANDSCENT so maybe there is a known issue.???
Anyone else had this problem??? id be grateful for answers....