Most commonly, wide tables that have been pasted in with set widths will cause text run-off, due to them stretching off the screen. To avoid this, we suggest that you make sure the table width is set to 100%.
You can do this by switching to Code View in your Table Wizard and ensuring that Table Style is set to 100% (table style="width: 100%;"). If it doesn't, edit the code to show a table width of 100% (or desired width).
If this does not work, contact Support for additional information.