Grin-miner looking weird in terminal

Hi!

I have a problem where grin-miner looks weird when running it in the terminal (see picture, showing a lot of question marks and weird characters. It’s on a Linux computer. Does anyone know the cause and how to fix?

pic

This has also been reported in Github, although that issue is about the grin node - see https://github.com/mimblewimble/grin/issues/2676