This is the behavior by design. When you click on a button or a combo box in the UI, the change specified is applied to the current editing style. All commands focus the editor right after they change the specific property of the current editing style, so that it is not necessary to click on the document again to get the focus. If you start typing right away, the text will be bold/italic/with the new fore color, etc.
However, the UI also tracks the position of the caret in the editor in order to reset the values it shows when the caret position changes. That is why when you click in the editor, the combo boxes take the values of the current editing style at the place in the document where the caret is in and update their values.
We will consider changing the behavior so that if the new position is the same as the old one, the values of the current style will not be reset. However, this change is far from trivial and is not currently scheduled.
Please, contact us again if you encounter any other issues with our products.
the Telerik team