Web login page link with port number not working in desktop, but working fine in mobile

Following is the link to my website.

https://zo-mmz.ch/case/GMIS/BA_107

This link is to the login page of my website. Logging using username and password redirect me to the required webpage in both desktop and mobile.

But when I use the port number with the above link as following. https://zo-mmz.ch:18070/case/GMIS/BA_107

Still it directs to my logging page. But unfortunately using mobile only I can go to the required page using my username and password. In desktop with the same username and password it doesnt redirect me anywhere.

Any reason for this? It would be really grateful if someone can assist me with this.