Try reuploading the first image in your gallery.
If I go directly to the image's URL in IE11 (bypassing Juicebox), I just get a broken image icon so there appears to be something wrong with the image (at least according to IE11).
Maybe the image is corrupt somehow (possibly during the initial upload) and some browsers are more forgiving (more tolerant towards whatever is wrong with the image) than IE11.
https://www.idrc.ca/sites/all/libraries … id%201.jpg
Hopefully reuploading the image will help.
Edit:
I think I might have found the root of the problem.
The first image in your gallery seems to be a PNG file with a JPG extension.
Unfortunately, there is a known bug whereby if you feed JuiceboxBuilder-Pro a PNG image and the image is not resized by the application (if you deselect the 'Resize Images' checkbox or if the image is already within the specified image bounds), then the PNG image is copied across to the gallery 'images' folder but it is given a '.jpg' file extension.
The workaround for your scenario would be to rename "Ahmed K Rashid 1.jpg" to "Ahmed K Rashid 1.png" (in the gallery's 'images' folder) and also change the corresponding imageURL entry in the gallery's 'config.xml' file from "images/Ahmed K Rashid 1.jpg" to "images/Ahmed K Rashid 1.png".
If the image is resized by JuiceboxBuilder, then the image will be converted to a JPG and all should be well (like with the image's thumbnail).
Incidentally, I have not been able to replicate this problem on my own test server.
When I feed JuiceboxBuilder-Pro a PNG image and allow the application to copy the image but with an incorrect file extension, IE11 still displays the image correctly in my own test scenario so the problem might somehow be connected to the web server hosting the image (possibly relating to MIME types).
The developers are aware of this problem and hopefully it will be addressed for a future version.
I hope that this information helps you to workaround the problem until it is fixed.