My wife tells me that Russian publishers sometimes just translated a whole series...and then kept "translating" books that didn't exist. She only found that out

My wife tells me that Russian publishers sometimes just translated a whole series...and then kept "translating" books that didn't exist. She only found that out after coming to America, trying to read the originals, and finding that what she thought of as the books at the end of various series often didn't EXIST in the original.