Thread:Project:Support desk/My tables don't appear sortable

I'm using MediaWiki 1.22.0rc2 and default template Vector. Everything works as it should. Except one thing: When I create a sortable table, it doesn't appear sortable. My code looks like this:

{|class="wikitable sortable" border="1" !data-sort-type="text" | Immobilie !data-sort-type="currency" | Preise in $ !data-sort-type="text" | Was bringt die Immobilie? !data-sort-type="text" | Wer kann die Immobilie kaufen? ...
 * Item 1
 * style="text-align:right" | $ 275.000
 * $ 150
 * Jeder
 * Jeder

In read mode, there is no arrows so I could sort the table.

I could not find any information about anything additional that needs to be installed or configured. What am I missing?

The wiki is closed/private, so I can't provide a link...