A member has shot a WA1440 Men 50+ which appears to be a new club record, but doesn't appear in the list of new records. When added manually the system reports that it is not a new club record.

Check if you have Apply Archery GB Age Limits (Rule 308) set.  This restricts long distance records to age groups A-D which excludes the 50+ (Groups L and M).  

There is an additional option to exclude 50+ age groups from Rule 308 which will allow this score to be listed as a candidate new record.