Holybro Kakute F7 sends jibberisch

I am trying to control my Kakute F7 via MavProxy on a Raspberry Pi 3. I have installed everything successfully, enabled serial port hardware so I can utilize the ttyS0 connection. Yesterday i already communicated successfully with it and it worked like a charm. Now when I’m trying to communicate with it there seems to be some kind of parsing error. It kinda looks like this. Has anyone of you ever seen something like this an knows how to fix it?

it’s also a little different evey time…for example the link 1 down warning doesn’t always appear. But then no link 1 ok message appears neither.