Is the 'central Tin atom' in crystalline tin oxide really offset like this?
From http://www.crystallography.net/cod/1000062.html one can see that Sn sits in the middle, without any displacement, and mimics the classic Rutile-type structure:



I checked original Wikimedia image, and according to metadata


  CIF retrieved from The American Mineralogist Crystal Structure Database


is no longer available. I also failed to discover this source:


  X-ray crystallographic data from:
  R. W. G. Wyckoff (1963) Second edition. Interscience Publishers, New York, New York. Crystal Structures 1, 239-444


Ideally, if you have *.cif file, it might be worth checking occupancies for the atoms you are interested in. Probably there is a 50-50 disordered Sn atom about center of unit cell, and you only observe a single site. As long as this is not the case, I would rely on the available COD data from 1971 instead.