Copying EMF image in to word from clipboard

I have a Java program that generates EMF(enhanced metafile) image and writes it to Windows clipboard. When I paste the image in to MS Word it changes image's scale for some reason. When I paste the image in to PowerPoint it doesn't get rescaled.

I can change the scale back to 100% and then it looks fine again but why is Word changing the scale on it's own? Can I prevent in somehow?

Demonstrated in the image, PP on the left and Word on the right. It's supposed to be a square.