WordPress custom login and register working fine on localhost but on site not working

Hello guys this is jack,

i would ask about problem make me confusing
when i made the
custom_login.php for custom login template
custom_register.php for custom register template

it’s work fine on localhost but on live version
the custom_login.php not working (displaying without error fine, but not login the user or redirect him to main page)
the custom_register.php working fine when user fill up the fields it’s saved on users table but as well will redirect the user after register from custom-register.php to custom-login.php

the php version on localhost 7.2.9 but on live version is 7.3.15
im not thinking the problem from the verison because the register form work fine? idk you guys can tell me please

i tried to added in wp-config.php

not working as well as i removed .htaccess as well not working ;(

the point everything in localhost work much more than perfectly!

custom_login.php

custom_register.php

funcation.php for both login , register