Indenting a list item with a sublist works incorrectly

Type

1. one
11. two
111. three

in the wiki editor, save and edit in wysiwyg.

When trying to indent the "two" element (with indent button or tab key)
on firefox: it is indented along with the element "three", since this one is a sublist. I think it would be better to move it one level further, to the same level as "three".
on internet explorer: item "three" is unindented (brought on the same level as "two").