It sounds to me like your "normal" template has somehow become corrupted or otherwise altered, perhaps intentionally by some customization you've performed or perhaps by some third party software or addin.
You might confirm that by going here (make sure that Word is not open)
C:\Users\
Your User Name\AppData\Roaming\Microsoft\Templates\Normal.dotm
If you open that and you see the tables you are describing then that is your problem.
You can rename it to something like NormalSAVE.OLD
Then open Word
It should create a new unblemished normal.dotm in the same folder as before.
NOTE: You may have to uncheck the box that says "Hide extensions of known types"