Sometimes during cataloguing we may not have entered the tags in the correct numeric order. For example: 520 _ _ $... 500 _ _ $... 504 _ _ $... So it will be nice that when saving the record, MARC tags can be auto sort into the correct numeric order, like: 500 _ _ $... 504 _ _ $... 520 _ _ $... Currently, you can correct this issue by saving the record in basic editing mode.
*** This bug has been marked as a duplicate of bug 27176 ***