When inserting a new table row in the "Rich text" tab, there's a blank space in the beginning of the cell. If the user clicks into the cell to edit it, the space will be in the beginning of the text, so the cell content would be say " Description" instead of "Description"
Note that after saving, the space is removed, so it's not a very crucial bug, but it's annoying as the user might think he has to delete the space to get the text properly aligned.
Example (reproduced with nbsp):
|heading 1||heading 2|
|col A1||col A2|
|col B1||col B2|