The horseshoe chart reminded me of this:
So, according to the politicalcompass.org team, based on stated positions, Hilary was to the right of Trump, albeit more libertarian on social issues.
They scored Sanders in the primary chart (they shifted the grid positions of the candidates after the primaries as the candidates clarified their policy positions). So, after the primaries, Trump shifted left, Clinton shifted right (reported in the media, of course, as both candidates shifting to the center).
Bottom line is yes, political positions do not sit cleanly on a unidirectional right/left horizontal line.