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If unrated players are allowed to enter, they may have entered as unrated then got a low rating after signing up.
Or they signed up when the had a rating over 1800, then quickly lost a few games sending their rating down quickly.
WHAT I would do is contact the tournament creator because they can actually kick people out of the tournament, and may want to if they want to keep the "lower rated" players out - then again, the tournament creator might not care. :-)