[otrs] closed notification garbled message

When I close ticket , the event triggered but in message body comes garbled one. Here I have just put one tag e.g. <p> <span style="color: rgb(0, 0, 0); font-size: 13px; font-weight: bold; line-height: 16.899999618530273px; background-color: rgb(238, 238, 238);"><OTRS_AGENT_BODY[5]></span></p> <br /> ​Can you please help why this could happen or where to check ?​ --------------- Warm Regards Darshak