This issue normally comes when usgin Nginx due to Nginx configuration.
You can find the following lines:
location / {
try_files $uri $uri/ /index.php?$query_string;
or
try_files $uri $uri/ /index.php?q=$uri&$args;
}
in your site's configuration (/etc/nginx/sites-available/yoursite.com).
Change it to:
location / {
try_files $uri $uri/ @handler; ## If missing pass the URI to Magento's front handler
}
location @handler { ## Magento uses a common front handler
rewrite / /index.php;
}
Lemme know if it does not work.
