CHwndRenderTarget is wrong size

Question

This bug is driving me nuts. I have an MFC application with a window in which I can draw and interact. The problem is that the size of the CHwndRenderTarget does not match the actual size of the window (I compare this using the CRect gotten from GetClientRect()). This results in all interaction being offset from where my mouse pointer actually is (not ideal). I have tried to ReSize() the CHwndRenderTarget with the correct values but it always returns false. Why would the CHwndRenderTarget be the wrong size?

Here's the code that I'm using to check sizes:

CRect clientRect;
GetClientRect(&clientRect);
//clientRect size is 1411 x 817

CD2DSizeF size = pRenderTarget->GetSize();
//RenderTarget size is 1128 x 653


//When I try to resize the RenderTarget, it always returns false
CD2DSizeU newSize( ( clientRect.right - clientRect.left ), ( clientRect.top - clientRect.bottom ) );
bool success = pRenderTarget->Resize(newSize); //returns false