I've been trying to find a solution to this problem on the Headway forum for a week now and they finally told me it was a WordPress problem.
Here is the reply I got:
"The images are going to overlap because the height and width are set within the post, which is a WordPress function, so they are not resizing as the browser does. You'd need to use media queries (CSS) to adjust this or find a responsive gallery plugin."
One week ago, I didn't have this problem and of course I tried with all the plugins deactivated. Images don't resize any longer when I shrink the size of the browser and in the wordpress galleries, images overlap.
I really hope you can help me, I'm at a loss.
Here is my site and everything is up to date: