I developed a "Districts Lookup Tool" for our state Elections agency to assist citizens with finding their election districts and elected officials assigned to the district in which they live. The tool is based upon the Zone Lookup Instant app, and has been working great for nearly a year. This morning I was notified that the popup titles for each of the layers in the results are no longer displaying the proper hyperlinks. I set the popup titles as hyperlinks so that users can easily get to the websites associated with their elected officials. I verified that the html is set up properly within the map, but the app shows the full html text instead of the hyperlink. I recreated a totally new Instant App from the original web map and it is behaving the same way.
Map Viewer Popup:

Instant App Results:

I know ArcGIS Online recently had some updates, but besides a break in functionality from the update, does anyone have any suggestions on what could be causing this? I've reviewed the new features in the Zone Lookup tool, and I could not identify any that would have an impact on the popup title.
Thanks in advance for any suggestions!