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To see what I mean -
SERP title - "Welcome to Adwords"
SERP title - "Google Adwords"
Both results go to the adwords homepage which has the title "Welcome to AdWords". I first noticed this happening when doing 1 word and 2 word searches of my employers name.
'Welcome to Adwords' is the title of the Adwords site, so it would make sense for that to be used in the search results page. OTOH, 'Google Adwords' is the link from DMOZ, and I seem to remember Google using that for the result heading from time to time (I know Yahoo does this with their directory).
because you used 'Google Adwords' as your search term, that might be the reason they used the DMOZ title instead of your regular one.