I tried english and any other and they disappeared. However, now i'm not sure that's the cause because just now they were gone too when i had only one language filter but they appeared again for no apparent reason. They still disappear and appear whenever i try adding any other language filters.
I'm having the same issue. I have English, Portuguese(BR) and Portuguese(PT) as filters, and that shows only Portuguese(BR) chapters on the "Top Chapters".
I just saw it now, this only happen when i enter with the "mangadex.org" url. If i enter with "mangadex/0", the top chapters list works, but i don't think it shows other language beside English.