janos♦ has a good points- the validator is a good idea and. In addition to the error that there are table cells outside of a row, there are also warnings that the table rows don't all have the same number of cells (which:
Warning: A table row was 1 columns wide, which is less than the column count established by the first row (6).
While many browsers should still display the validator can help you find)table as expected, there may be some browsers that would displayed it in a strange fashion.