I found a work around, using to_number function around the column query, e.g. where to_number(max_client_resp_service) < 110 yields correct results.  So strange it's as if the numeric(15,2) column is being stored or queried as an varchar string.  Perhaps there's a wrong typed index on this column, but I can't seem to determine the index type if any on this column from INFORMATION_SCHEMA.INDEXES.