There is the StackExchange menu at the top left on every site in our network. It opens a popup box with
On Mathematics, Latex expressions are allowed in question titles. But they are not rendered correctly in the mentioned
Hot Questions menu from within other StackExchange sites.
This may be because they are not enabled to render LaTeX expressions, but this site is. Since question titles from Mathematics are displayed on other sites of the network, they should be rendered correctly there, too. Can't we render those expressions correctly on all sites of the network?