why does textscan import twice rows of data?

why does textscan import twice rows of data?

When I use textscan to import my csv data, it doubles the rows. I have
only 2000 rows of data, but 4000 rows of data are imported. fid = fopen
('RawDataRep.csv','rt'); data = textscan(fid,
'%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s','Delimiter',',','HeaderLines',1);
fclose(fid);