The problem appears even when I open the 'Table Of Content' dialog in 'Reference' ribbon. In this dialog in the problematic documet the 2 build-in-automatic-tables that are suggested to me, the page numbers appear in the left side, unlike all other documents that I open in which in this dialog the header are in the left and the page number are in the right.
It's word template dialog even that changed
If I could attach a screen-shot to this forum it could make it quickly understoond

So the change should be in the document level styling/ formatting/ template...