I have installed different sites through my admin panel as below screenshot.

But when I click any of the menus of My Sites it is redirected to the wrong URL like,

• https://www.example.comwp-admin/netowrd instead of https://www.example.com/wp-admin/netowrd
• https://www.example.comwp-admin/netowrd/sites.php instead of https://www.example.com/wp-admin/netowrd/sites.php

Problem is happening only with this menu.

Means slash is removed automatically after domain or before wp-admin.

Why this is happening? How to fix it?