Hi , I had the same issue. In fact it's a missmatch between Lowercase and Uppercase of the DomainNetBiosName.
To correct this issue , you have to modify the "ad-domains" search macro to force the domainname in Lowercase . ( settings / advance search ) .
Modify the macro like above:
inputlookup DomainSelector|stats count by DomainNetBIOSName|where length(DomainNetBIOSName)>0|eval DomainNetBIOSName=lower(DomainNetBIOSName)|rename DomainNetBIOSName as src_nt_domain
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