Server API call twice issue

[TheFinestArtist]

Started GET "/api/v1/users/18" for 127.0.0.1 at 2015-01-08 14:02:10 +0900
Started GET "/api/v1/users/18" for 127.0.0.1 at 2015-01-08 14:02:10 +0900
  ActiveRecord::SchemaMigration Load (240.5ms)  SELECT "schema_migrations".* FROM "schema_migrations"
  ActiveRecord::SchemaMigration Load (240.5ms)  SELECT "schema_migrations".* FROM "schema_migrations"
  User Load (308.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1  [["id", 18]]
  User Load (308.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1  [["id", 18]]
  SchoolsUser Load (307.3ms)  SELECT "schools_users".* FROM "schools_users" WHERE "schools_users"."user_id" = $1  [["user_id", 18]]
  SchoolsUser Load (307.3ms)  SELECT "schools_users".* FROM "schools_users" WHERE "schools_users"."user_id" = $1  [["user_id", 18]]
  School Load (214.0ms)  SELECT  "schools".* FROM "schools" WHERE "schools"."id" = $1 LIMIT 1  [["id", 1]]
  School Load (214.0ms)  SELECT  "schools".* FROM "schools" WHERE "schools"."id" = $1 LIMIT 1  [["id", 1]]

I don't know when exactly this issue occurred, I thought this was some kind of my laptop problem at the first time. Even though I rebooted and it keeps bugging me this error.

When I call an api server handles it twice somehow..

[TheFinestArtist]

I think it logs twice somehow. Not doing the same thing twice.