Can you give me feedback on these q

Can you give me feedback on these questions ahead of the 8D:
• Date code: if the last delivery was 5th April (Week 14) how can we have a date code 16-13?
• Is it likely to be an operator specific problem or a process problem?
• Could it affect other Power Management (& other customers’) part numbers if they have the same design of heat shrink sleeve over a contact that has to be inserted into a connector?