Many thanks for getting on this one so quickly.
I’m still developing locally and not keen to upload until I fix this. I notice that your own ‘demo’ site at http://gracethemes.com/demo/creator-world-pro/ behaves exactly the same way – if you click on the images in the ‘Our Projects’ section then it opens a new tab. Can you diagnose from the demo version?
(I notice that if you click on an image in the ‘Our team’ services then it does not open a new tab, much better for my purposes).