When importing a file you may receive a error: Exception message: Field "XX" does not exist in the current row. You may also notice that the batch that is created from this import is successful and can be committed.
Check the import file itself, the import engine believes their are extra rows that are being purged in the actual import process. For example there may be two <enter> fields in a header row and one needs to be removed.
A good way to see unusual breaks or characters is to open your .csv file in Notepad ++ and you may notice where your issue lies.