Hi SANDRA HUMPHREY,
First unpublish the project from the experience server related to the old ThingMark.
Secondly; Is the Experience Service same? If not; you need to update that for the Project.
Thirdly as Giri mentioned; update the Project configuration with the recent ThingMark values. And bind the ThingMark Widget property with the ThingMark application parameter valve.
Then Publish the Project again with the new ThingMarks.
I hope it helps.