Sorting is not shown on live site (anymore)

Hi, I recently had to update my wordpress installation and Kalium portfolio theme manually. Since then the Post Type Order arrangement of portfolio items is no longer reflected on the site; my items show in a random order. I reinstalled the plugin but the problem remains.

Changes I make either in the list of the portfolio or in the list of the plugin mirror each other. But nothing changes on the site https://www.fusion.be

Any idea what I can do about this? My wordpress knowledge is pretty basic.

Thanks in advance
Stefan