First of all I'll assume that you are using DBD::Sybase along with FreeTDS. If that's the case, then multiple results are returned like this:

do {
    while($data = $sth->fetchrow_hashref()) {
        .... process $data ....
    }
} while($sth->{syb_more_results});
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My guess is that you are issuing something like this:

select count(*) from table where ...
select ... from table where ...
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In that case the first time through the do/while loop you'll get the output from the COUNT(), and the second time you'll get each of the rows from your SELECT.

Michael