For a few days, I've been noticing that often (but not always) the second sub-result on a reddit post is translated to Norwegian (my own language, and the search region I use). Today, I ran into another more extreme variant, where the last sub-result to a reddit post was the same as the main reddit post, and translated to Swedish:
https://kagi.com/search?q=ducky+one+3+qmk+&r=no&sh=Yu7AQsYzl_ls7LZZ_1RgHg

Another one with a norwegian result, but a fully different post (sub-result 3):
https://kagi.com/search?q=openrgb+gmmk&r=no&sh=h7L_aPyxfPDbkTLXAqI-1w

This is the more common scenario, where other reddit posts appear, and one of them just happen to be translated to Norwegian. For the record, in both these cases, the source posts are English, not Norwegian or Swedish.
As far as I can tell, this is specific to reddit links. I have not (yet) experienced this with any other sites than reddit. For good measure, though I doubt it's relevant, I use the pre-provided reddit->old reddit URL rewrite thingy:
^https://www.reddit.com|https://old.reddit.com
I don't know if this matters.
I'd expect the posts not to be translated, or at the very least not include duplicate results. The translation only happens in search, not on Reddit itself. The translated links (including in the case of the outright duplicate links) are not special. They just link back to the same post, without any special parameters for translation or anything like that, so they're functionally identical - aside the weirdly translated excerpts in search only.