The byte order mark is the problem. Will open an issue @github.
Same for me. I assume there is some encoding shit going on with the array keys.
If I dump the $row inside Import_Form::results_table() the keys and values are visually okay. But if I try to dump a value by its key, e.g. var_dump($row['#Code']); i can’t access the value (=NULL) of the array. If I access the value with var_dump($row[array_keys($row)[0]]); it works.
PHP 5.6.4