Inconsistent Data Identifier Matches for CC numbers

Hello:

Version: DLP v 11.6.2.

I'm using Vontu's pre-built data identifier for matching CC numbers in a policy configured at the Medium breadth.

Within the medium breadth section, it shows the matching data patterns beginning with "2014", as shown below:

I have a department that sends out invoices that require payment from customers where the beginning 4 digits are "2014", as that is the current year, with 11 digits immediately following it.
It has come to my attention that not all of the invoices have triggered the policy, even though all document have the "2014" prefix.

For example: Invoice number "201401280000016" triggered the policy but "201401280000003" did not trigger it.
 

I am not sure why certain invoice numbers will trigger the policy and others will not. I need to determine a root cause for the business unit and propose a solution. I do not want to reduce or raise the breadth as this might increase my false negatives and/or my false positives.
Currently, we are operating using a static exclusion code I generated so they can conduct business uninterrupted.

Please advise. I am postponing calling tech support until I hear from the boards.

Cheers!