Steps to reproduce:

1. Create a table in 3x3 in Excel or Open Office Calc
2. Copy this table.
3. Paste into a Confluence page.
4. You'll see that there isn't an option to sort the tables there.

Workaround:

• create a new table from scratch
• copy all cells of the faulty table (which was most likely just pasted from MS Office to the Confluence page) by clicking first in the first (top left) cell, then shift-clicking in the last (bottom right) cell and copying the whole (CTRL-C or contextual menu)
• paste the clipboard into the first cell of the newly created table
• delete the "old" table
• save the page

Source Editor:

1. The first table is pasted from Excel, the second one was created via workaround:

   <table>
     <colgroup>
       <col/>
       <col/>
     </colgroup>
     <tbody>
       <tr>
         <td>Number</td>
         <td>Customer</td>
       </tr>
       <tr>
         <td>1</td>
         <td>
           <a href="http://Atlassian.com">Atlassian.com</a>
         </td>
       </tr>
       <tr>
         <td>2</td>
         <td>
           <a href="http://Bodybuilding.com">Bodybuilding.com</a>
         </td>
       </tr>
       <tr>
         <td>3</td>
         <td>
           <a href="http://Youtube.com">Youtube.com</a>
         </td>
       </tr>
     </tbody>
   </table>
   
   
   
   
   <table>
     <tbody>
       <tr>
         <th>Number</th>
         <th>Customer</th>
       </tr>
       <tr>
         <td>1</td>
         <td>
           <a href="http://Atlassian.com">Atlassian.com</a>
         </td>
       </tr>
       <tr>
         <td>2</td>
         <td>
           <a href="http://Bodybuilding.com">Bodybuilding.com</a>
         </td>
       </tr>
       <tr>
         <td>3</td>
         <td>
           <a href="http://Youtube.com">Youtube.com</a>
         </td>
       </tr>
     </tbody>
   </table>