Multi col ordering does not work

jpeg00

I have a html clientside datatable, where only random columns when shift ordered work:

• Sorting by "Rating" and "Available QTY" - works
• Sorting by "Price" and "Available QTY" - does not work
• Other combinations work only randomly, most of the time (99%) they do not work

Is there some option I forgot to set or do I have to setup some custom "columns.orderData"?

Debugger: https://debug.datatables.net/usolil

jpeg00

In the official example the same issue seems to happen, am I maybe just misunderstanding the capabilities of that feature or how to use it?