I am not able to explain it, but if you look at the horizontal ruler in your document, it gets laterally inverted when you select the table. And when you place the cursor anywhere outside the table, the ruler reverts to normal. Have you vertically flipped the tables somehow? I am not aware that there is such feature in Word, but other than that, I can't understand how it happened.

Also, if you convert your table into text, the text matter in the last cell of each row is placed first and that of the first cell is placed last. This again goes to show that the table has been laterally inverted somehow.

Thanks for your reply Venky. I received such a file from another person, so I am not sure if he has done something. There does'nt seem to be a way to flip the tables