test environment

we created a subdomain for the test environment but a problem has been created for us!!
problem is when we click https://dev.my-sellory.com our main site my-sellory.com will open:(((
we use Nginx and centos

At first please make sure that the config.local.php file and Administration → Storefronts page contains correct URLs. Then try to delete the var/cache directory on the subdomain store manually