Word sets seemingly randomly mixed

I added a bunch of words to a level, from an Excel spreadsheet each with the foreign language in the left column and the native language in the right column. When you Bulk Add these words, they get sortof randomly mixed up. Sometimes the ‘native’ and ‘foreign’ languages are swapped around. This is very frustrating and takes a long time to fix manually. It also makes no sense, because the exact same method worked perfectly on earlier occasions.