Glitch when Searching for Records in the Record Picker

Some of my records are not coming up when I search for a part of their name in the record picker. I double-checked and it does not have a filter, so it should be able to return everything in the table.

I can get shipment #12760 by pasting in the full name of the shipment.

When I search using just the reference number 12760, however, it gives me no results. I only have one shipment with this number in the name.

For other shipments, typing in the reference number is enough to bring it up the corresponding record. Iā€™m not sure what the difference is between the shipments that work and the shipments that fail.