Backend Laravel Bug Fix => Table content only visible on Mobile Devices and not on Desk Top

Hello,
There is a Backend made with Laravel.

The task is to fix the following bug:

When using a mobile device (I mean, real Mobile Device and not the "Responsive Design Mode"): Listing of Items appears.

The bug is: This data does not show up at PC.

https://supplier.comunidadfeliz.org
Login:
Admin: admin@gmail
Password: password