The very useful, monthly taxonomy export in the Darwin Core Archive format contains some of vernacular name files redundantly. For example currently VernacularNames-hnahnu.csv or VernacularNames-.csv is listed several times in the meta.xml file inside https://www.inaturalist.org/taxa/inaturalist-taxonomy.dwca.zip
Not a deal breaker, but you still might want to fix that.
There are also many vernacular names given with dc:languge=und for Undetermined, while there is a custom term https://www.inaturalist.org/terms/lexicon that says for example Slovakian which would be slo. Any chance to improve that?
seems like this would be addressed with:
That sounds indeed like the root of the problem
https://github.com/globalbioticinteractions/globalbioticinteractions/issues/427
https://github.com/inaturalist/inaturalist/issues/3862
Maybe this issue on GitHub will fix your problem. I remember weird things in the meta.xml but probably I did not create a topic for it.