database - Why does this MySQL Query returns two rows? -

my query returns 2 rows second exact duplicate of first. know reason why happening? know if put limit 1 in end return single row request not suggest solution. here query

select u.username,u.password,u.registerdate,u.lastvisitdate,u.lastvisitip, u.activationstring, u.active,u.block,u.contact_id,c.name,c.email,c.pphone,c.sphone,c.rphone,c.area_id, a.name areaname, a.city_id, ct.name cityname, ct.state_id, s.name statename,  s.country_id, cn.name countryname  users u  left join contacts c  on (u.contact_id = c.id)  left join areas  on (c.area_id = a.id)  left join cities ct  on (a.city_id = ct.id)  left join states s  on (ct.state_id = s.id)  left join countries cn  on (s.country_id = c.id)  u.id = 1 

above query fetching data 6 tables includes

users s contacts c areas cities ct states s country cn 

all 6 tables above have primary key named id foreign keys follows

users.conntact_id contacts.area_id areas.city_id cities.state_id states.country_id 

why returning 2 rows instead of one?

one of tables join has more 1 element, others repeated. table contacts table.