We just completed the uptake of content at 3M and didn’t encounter this issue. The theory of issuing terms without the Mod10 check digit is still adhered to. I’ve got the LoincTableCore open and filtering on either component or the beginning of a LOINC term.
I suspect there is a corruption or format issue with the download at your facility. Will you have someone investigate? The 444** numbers listed for Amdinocillin in your email are for other chemistries.
These look to be the 12 LOINC codes where Excel interprets the values as dates. If you open Loinc.csv in Excel, it will try to be helpful and convert the codes to a date, e.g. 1-8, 2-6, 3-4. The 12 can be found using this SearchLOINC query (LOINC login required):