Now what you are reporting is something else. What does in look like in your memberlist page when you reduce the width of your browser? The responsive css kicks in when you get to 700px. It should not make the header part go away. And if the images are gone too then maybe it is some other extension doing that.
On responsive the text in the header title will be on one line, not in the header anymore... and the icon images will be on a line under each title. Just like your memberlist page.
Now you want get that like I described with the table template you have now because the column titles are not in the header. But when I'm done you should get something simular to what you see in your memberlist page.
Test your memberlist page and see if things screw up there the same way when checking responsive view.
[ Post made via Samsung Galaxy S5 Active ]
