Hi @lukasg53320518 ,
I tried using the font you mentioned, "Klinic Slab". I downloaded it from https://www.dafontfree.io/klinic-slab-font-family/ and was facing a similar issue. Out of 8 font variants, only two worked for me.
This seems to be a font-related issue, and as this font doesn't belong to Adobe, I recommend you contact the font owner directly.