Hey, my users are getting their val

Hey, my users are getting their validation emails but they point to this site "osclass.org" instead of my site, then they get a your already validated message, they never get validated on my site. how can I fix this?. Thanks in advance.

Hasil (Bahasa Indonesia) 1:

Hei, pengguna saya mendapatkan email validasi mereka tetapi mereka mengarah ke situs ini "osclass.org" daripada situs saya, maka mereka mendapatkan pesan Anda sudah divalidasi, mereka tidak pernah mendapatkan divalidasi di situs saya. Bagaimana aku bisa memperbaikinya? Thanks di muka.