When you attach a drawing file as an xref, you link that referenced drawing to the current drawing.
Your office has custom title block fields, created using the Auto CAD DWGPROPS command, which are designed to update automatically when placed in a drawing set.
You brought a title block into a drawing as an Xref, and these custom fields did not update.
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If you copy or cut and paste a sheet view, the new copies will not be linked to the original source view.
Reference drawing layers can be modified in the parent drawing and changes to color, linetype, and other properties are maintained as long as the system variable Visretain is set to 1.