I've created a test case below which replicates this problem. If you put the html below in the editor when using IE 9 and toggle between source and design view you will see the row order change from 1,2,3,4 to 4,3,2,1 and back again.
All works fine in Firefox and Chrome.
All works fine in Firefox and Chrome.
<body> <table> <tbody> <tr> <td> <table> <tbody> <tr> <td> row1 </td> </tr> </tbody> <tbody> <tr> <td> row2 </td> </tr> </tbody> <tbody> <tr> <td> row3 </td> </tr> </tbody> <tbody> <tr> <td> row4 </td> </tr> </tbody> </table> </td> </tr> </tbody> </table> </body>

Re: Multiple tbody tags in IE 9 are re-ordered
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Re: Multiple tbody tags in IE 9 are re-ordered