Mavlink outputting random letters to pi terminal

Recently connected my Pixhawk 4 to my Raspberry Pi 3 and everything works fine except for the mavlink outputting random numbers and letters to my terminal at all times. The terminal ignores these characters and I am able send commands such as “mode LOITER” or “arm_throttle” but these characters make it hard to see what I am typing at times and is frankly pretty annoying. In the screenshot below, you can see the random characters at the bottom and if I let it go a little longer before taking the screenshot these random characters would continue to constantly be outputted onto my terminal. Any help or suggestions would be much appreciated.