Sms / new compose sms already have text in it

Iphone 5 / factory unlocked / USA purchase..

Whenever i compose a new message (SMS), i already have a text (one of the previous sms that i hv sent to someone) there in the message box. I have tried resending the same to myself and other numbers and it gets delivered aswell. But what is annoying is everytime i have to compose a new message and click on icon on top right corner in message app to create a new sms// i have the text alrdy in my typing box and have to select all and delete it.

And when i click on any previous conversations with my contacts and reply them this problem does not exist.

This is only when i click new message compose icon or have to start a new conversation with someone.

To me it seems as if some kinda signature is added in SMS but i couldnt find any option for the same.

Please advice !!