I've been using WORD a long time and never had this happen...

I pasted an image from Illustrator into a WORD document, looked at the print preview which looked fine, and printed it down. The entire thing came out MIRROR IMAGE!! So I went back into Illustrator and exported the image as a jpeg, pasted the jpeg into WORD, print preview looked fine, printed down fine! What the heck made the Illustrator image print backwards?