Thank you for your update.
On further analyzing, the reported table cell width issue due to the word viewer application which you have used in your iPhoneSimulator. We have checked the same document with Microsoft Mobile Office application, in that table cell width are preserved properly as defined in ResetCells(int rowsNum, int columnsNum, RowFormat format, float cellWidth) method of WTable class. For your reference we have attached the screen shot below. The same issue will occur when you open the MS word generated document in that word viewer application, so it is not an issue in our side. Kindly make use of MS Mobile office or any other word viewer application to resolve the issue.
Please let us know if you have any other questions.