Work Item Labels - Not working for multi-line text fields

For some reason, it seems that field Labels for work items are not working for me for multi-line text fields. For instance, I have a work item field named "Test Setup Steps," but would like it to be displayed as "Test Conditions" on a certain work item type. I have changed the Label on that work item type for that field to "Test Conditions," but "Test Setup Steps" is still displayed on the actual work items. Has anyone else run into this before?

Labels seem to be working on other fields for that work item type.