There is data in the custom fields in OTBI but they are not showing in the UI

Summary:

We have created a number of custom fields in Case Management for different case types and we are migrating data over from a legacy system. Most of the data has gone in to the fields with no problem but there is some data that is in OTBI but not showing in the UI, and if I go to manually add the information to the Case it still doesn't show. I've checked the fields in Application Composer and they match what I've exposed in VBS, they are also marked as updateable. Has anyone come across this issue before and how did