Jira has made an upgrade to the cloud with the Scrum boards. They now have an enhanced version which provides some UI enhancements. Unfortunately, it also introduced a bug.
In the non-enhanced version of the scrum board, when you hover over a field, there is a popup that shows the value of the data (numbers, text) in that field. But when you do this in the enhanced version, it only shows the name of the field, not the contents.
I have submitted this to Atlassian and they have confirmed it as a bug. Please vote this up so it will get visibility and they will fix it: https://jira.atlassian.com/browse/JSWCLOUD-25988