While typing in the control and selecting text from the right or from the left, the text within the editor seems to behave very strangely. For example:

 

Type three lines of text, now select the top line of text from right to left. Change the font size to 3. Now change it to 5. Click off of it, now select it again from right to left. Try to make it font size 2. Now click off of it, select the line of text from left to right. Choose font size 5. Now choose font size 3.

Any idea why this is and can it be fixed?