"Usage hint on the message card" issue with AWS IoT Core

[bayoojo1]

I'm using mqttx client to publish data into aws iot core. When I automate my payload with a script, it prepends the text "Used script.js Function And schema.proto Schema" on top of the payload. Getting to the AWS IoT core, the payload does not display, but instead, I get an error: "Message cannot be displayed in specified format."
I can successfully publish the same payload without any error if I don't use a script. So, how can I remove this usage hint?