It isn't all that uncommon for an NDB to mis-key. There are those which are clearly wrong letters and those where the keying is so uneven that it sounds like something else. One which comes to mind is "NEL" which for a period of time was keyed so that it sounded like "DL".
Russ Edmunds
WB2BJH
Blue Bell, PA
Grid FN20id
http://www.hard-core-dx.com/article.php?story=20190103191504276