Search Panes : sorting the panel content stop working at the third click

Link to test case:
Debugger code (debug.datatables.net):
Error messages shown:
Description of problem:

Hi,

When you sort a panel with the button « AA » or « # », it works 2 times. And if you're trying a third time (the same button), it doesn't sort anymore.

You can try it on the example page : if you click 3 times on « AA » for Office, the 2 first sorts will work, not the third

https://datatables.net/extensions/searchpanes/examples/initialisation/simple.html