This happens fairly often on German Netflix. When the program's language is neither German nor English, often there are no English subtitles available.
International licensing is obviously complicated, so it's hard to say whose "fault" it is, but my suspicion is that some rights owners will only license the service to use the local language to prevent end users doing digital geo-arbitrage.
For example, the Swedish series "The Bridge" is available on German Netflix, and the trailer has English subtitles, but the actual episodes only offer German subs. AFAICT in the US market this show is only available for streaming as a purchase from Amazon.
However, the language options offered beyond those already provided by Netflix are machine translated. This is good enough to follow along or fill in gaps in your knowledge of the officially subtitled language, but is a subpar representation of the program.
It is very common for languages other than English. I'd say most Netflix content has the French audio and subtitles not matching each other. They have the same meaning but not the same wording.
Though I also wish they'd let me set better defaults. They let you give a list of languages you prefer, but that's too simplistic. E.g. I'd prefer to always get original audio, but subtitles matching the audio in a handful of languages I know well enough to follow if I can read but not only by audio, and falling back to English.
Instead you need to check for each series what is available, or set it broad and change it per program accordingly.