That's weird characters lol, why the subject (Re: আমরা কি আদেও সেইফ?) works but the below message does not. I'll check into this maybe tomorrow. Tell me if other motivation mention from your local has the same issues.
You created the bot, not me, dud! How am I supposed to know? Lol

Btw, I think, I have seen such characters before, when you save a notepad containing Unicoded character without specifying the encoding format, this happens! It saves as some random messy unreadable texts!
Ok, I'll ask some of my local folks whether they encountered that weird characters or not!