I developed my site using firefox and saw no problems. Then I went to my ipad to have a look at it. The slider on the presentation side doesn’t work correctly. Then I tried Safari on my mac and found it had the same problems. Same problem on the standard browser on an android phone.
At the same time some of the pictures in the columns below the slider want load at all on the presentation page. Again the problem is consistent across ipad/safari/android phone.
A search on internet shows many others have experienced these problems, but it is not on your issue list.
Is this issues you are looking into?