Formatting of Recently-updated macro broken at the space level if not using Default Confluence Theme

The formatting of the recently-updated macro used at the space level (Browse Space > List Pages - Recently Updated) is broken when the user has applied a different theme.
I.e. The behaviour is only normal when using the Default Confluence Theme.

I've confirmed this is broken in Confluence 2.7.1, however 2.7.2 has this problem fixed.

The symptoms are that the user will see a distorted list of items with heaps of spacing. Refer to screenshots for more information.

If you are experiencing this problem from 2.6.x to 2.7.1, the workaround is to stick to the Default Confluence Theme or to upgrade to 2.7.2.