You tube descriptions showing in German(?) on midwest.social

This is something that I couldn't find an obvious setting for, but someone pointed out that the descriptions are different on different instances.

This post has a German (?) description on midwest.social, but on programming.dev it's in English.

In my settings:

• Interface language is Browser Default.
• Languages has Undetermined and English selected

All other descriptions on posts are in English, only youtube seems to be different.