There's an example here: http://jsfiddle.net/cburschka/ve5fbujq/

The non-animated toggle() appears to work normally. An animation like toggle('slow') will put a display:inline-block property on the <span> element, which in the above example causes the red text to drop to a new line instead of wrapping normally.

This happens whether or not the span was explicitly set to display:inline earlier, or was just inheriting the default value.

This bug seems similar to #1774 (apparently closed prior to the release of 2.1.3), but isn't quite the same.