site ranked twice in a row with parked domain?

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I have a website where the domain name is my company name. The domain name
was registered April 23.

I also registered my own name about a month later (very different from the
company name!) I have never, ever used that for anything & I didn't even
tell anyone I know that I registered it.

I just parked it on top of the company name and forgot about it.

So, today I was checking SERPS for my primary keywords on Yahoo. And I was
stunned to find:
for one SERP, the domain name with my own name, ranked #1.
for another SERP, the business domain name ranked #1, with the domain name
with my own name at #2 (same webpage!

I just changed the "my name" domain to its separate hosting account, which
now just redirects (301) to the company site, instead of being parked.

Guess that will probably solve the problem, but I am still wondering - how
on earth did my "personal name" domain get indexed by Yahoo and why did they
include both domain names one after the other? (the same page twice)

cheers & gracias ~

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