The Export to Excel option on a custom portlet does not export the Range Description. The Range Description option on a field is being used as a way to display both the Image and 'name' of the lookup value on the list view. The 'name' that is displaying on the portlet is not the actual name, but the Range Description. However, when exporting this to Excel, Excel shows the Image and lookup code instead.
Caused by DE59268
Release : 15.8.1, 15.9, 15.9.1, 15.9.2, 15.9.3
Component : CLARITY STUDIO
FIXED in Clarity 18.104.22.168 (patch 1) and 16.0 as DE59268