How to make sure all images are real size

This is the code I am using but unfortunately 3 images are still not loading real size but like 84% of their size. Rectangular images should be 340px wide and 170 height, except the one with the bike which should be 340 high and 170 wide.

[cactus-masonry masonry=”true” post_category=”English” show_posts=”true” quality=”medium” link_location=”post” display_post_titles=”true” horizontal_spacing=’5px’ vertical_spacing=’5px’ post_order=”ASC” show_loader=”false” width=”true” height=“true” minHeight=”170px” minWidth=”170px”]

Thanks for your help