Overview: Stripes has changed the rendering of mandatory versus non mandatory fields. And UI-Inventory needs to align. See for example non mandatory fields are marked as mandatory, which are not mandatory.
All forms in UI inventory needs to be checked.
Further details in
The front-end change is trivial assuming this is just a labeling mistake and there is no actual discrepancy with required fields on the back-end.
The elements which are required for instance, holdings, and item records can be verified in: Required Elements Inventory Beta - Metadata Elements