D2D coordinates not matching screen coordinates

I am using D2D with D3D11. I have some code that uses GetCursorpos() from the windows API which is then converted to client coordinates and then draws a small circle at this position using D2D FillEllipse(). The screen to client coordinates work perfectly but for some reason D2D draws the circle a small distance from the expected location (tens of pixels) as if the coordinate had been scaled by a small factor so that the error gets larger as the circle is drawn further from (0, 0). I noticed changing the dpi for the D2D1_RENDER_TARGET_PROPERTIES affects this 'scaling' so I …