Problems using custom fields for product pages

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.6.0
-- PHP version -- : 5.6.23
-- Browser(s) name and version -- : Chrome 51.0.2704.103 (64-bit)

I have never had this problem before, and I use custom fields on product pages all the time. I tend to use them to show specific formatted information about the product. In this case the products are courses, and I am needing to display credit hours, availability of the course, and who is eligible.

This is a very simple task and one i have done hundreds of times without issues. However this time all I am having is issues.

I created the first field, of type product, and no matter what I could not get it to display on the back end product page so that I could populate the values of it. I deleted it, recreated it, changed settings on it, nothing worked. For grins I created the second field, and suddenly the first field was showing, but not the second field.

At this point I thought that maybe there was a bug and it was only displaying N-1 of the total number of custom product fields. So I immediately created the other needing fields and added a 4th one that was a dummy field.

When I checked only the first field I added was visible on both the front end and back end. The other fields were just not displaying at all. The settings of all 4 fields are EXACTLY the same.

I am stumped. As I said I have done this hundreds of times with no issue at all, and now suddenly I have issues. The only real different with this setup is that I am running on Joomla 3.6.

Has anyone else had this issue and solved it? Any thoughts on how I approach debugging this?

Any help at all would be appreciated. Thank you.