browstat getblist - blank entry in result

On one subnet within DomainA I have DC1 DC2 and Server1.

If I run 'browstat getblist 1 DomainA' from DC1 I get:
Browser: \\Server1
Browser:
Browser: \\DC1

If I run 'browstat getblist 1 DomainA' from DC2 I get:
Browser: \\Server1
Browser: \\DC2
Browser: \\DC1

Running 'browstat getmaster 1 DomainA' from both DC1 and DC2 produces the
same result 'Master Browser: DC1'

Can anyone tell me why I get the blank entry from DC1 and if I need to
resolve it, how?

Thanks in advance.

Pete.