FYI.
Went and generated a spreadsheet then set all my models start numbers.
Checked the Test tab to look for Overlaps and missing effects. Found some that I had put wrong start number, it's an age thing, in so went and corrected.
Checked the Test list and nothing had changed.
Conclusion. I had to shut down xL4 to get the list to update. When xL4 restarted all was in order.