Why does this MySQL Query returns two rows?

my query returns two rows where second is the exact duplicate of first. i would like to know the reason why is it happening? i know if i put the LIMIT 1 in the end it will return only a single row so i would request not to suggest this solution. here is my 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 as areaName, a.city_id, ct.name as cityName, ct.state_id, s.name as stateName, 
s.country_id, cn.name as countryName 
FROM users u 
LEFT JOIN conta开发者_运维百科cts c 
ON (u.contact_id = c.id) 
LEFT JOIN areas a 
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) 
WHERE u.id = 1

Above query is fetching data from 6 tables which includes

users s
contacts c
areas a
cities ct
states s
country cn

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

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

why is it returning two rows instead of one?

One of the tables you join into has more than one element, thus all the others are repeated. This table most probably is the contacts table.