DC Weirdness (Not showing FQDN just hostname)

I'm facing some weirdness with one of our DC's. As I found out after running a DC Diag the DC which is our PDC & Domain Naming Master is returning just the Hostname instead of the FQDN, example:
C:\Users\admin>netdom query fsmo
Schema master                 AD01.Bank.LOCAL
Domain naming master   AD02
PDC                                    AD02
RID pool manager             AD01.Bank.LOCAL
Infrastructure master       AD01.Bank.LOCAL
The command completed successfully.

C:\Users\hostedcafe>nltest /dclist:bank.local
Get list of DCs in domain 'bank.local' from '\\AD01.bank.LOCAL'.
mexico_01.bank.LOCAL     [DS] Site: Mexico
clarkson_02.bank.LOCAL   [DS] Site: Clarkson
AD01.bank.LOCAL              [DS] Site: DC
AD02 [PDC]                         [DS] Site: DC
The command completed successfully

I started researching this but cannot find anything similar.
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Will SzymkowskiSenior Solution ArchitectCommented:
Check your DNS FQDN Zone, for this specific DC. make sure that correct record exists. Also check your SRV records as well for this DC specificically (_msdcs.domain.com folder).

I think this is a DNS related issue which is not showing the FQDN for this specific DC.  

Henrik JohanssonSystems engineerCommented:
DNS records in _msdcs is normally registered dynamically by DC.

If GUI install: Check the system properties dialog (sysdm.cpl) on the DC without FQDN and check the 'Full computer name' value. By default primary DNS suffix for a computer will automatically be changed when joining a domain, but it can by some reason had been disabled.
Primary DNS suffix is displayed in ipconfig/all command.

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