In the 2D floor plan drawing the red ovals show where either the 2D wall or the 3D wall changed workplanes and they both are on the same plane corrupting both.
The blue circles show the walls not joining due to the same shift.
In the 3D render the JPG shows the walls reference point has shiftted when the walls were selected and I do not know the reason for that.
This happens when the 2015 file is opened in 2016, this is not the only drawing this happens in, everything I open has these problems and some are worse than others. I have Installed 2016 on my lap top as well and it does the same thing.