Portfolio images coming up in Google search without watermarks

Hi, I did a search for my name and quite a number of my illustrations from Fotolia come up with no watermark. When I click on the link to go to the site it takes me to my Fotolia portfolio and all my images are there (very large I might add) without watermarks. How can this be? Why are they not watermarked? These images can and are being easily stolen and offered for free on other websites at the size on my portfolio. I easily copied some of my own images myself by clicking and dragging. I have thousands of images on this site. What's the deal with this?