GS Further Interview

Hi.

I had been invited to the GS Asia final round in NYC but because of visa problem, I was not able to attend the superday.

So they arranged me a telephone interview for the final round instead, I thought the interview went ok, but late at night I received a call from HR telling me since they've just heard me on the phone, they would like to arrange a further interview for me in London sometime this week(im in UK).

I know if I managed to get the offer straight away if will be extremely unfair to those candidates who flew over and attended the whole Superday in NY. But still I am wondering is this further interview thing a normal process or if I should see this as a negative sign as they don't really want me that much? And I am assuming they are sending offers rite now, will this further process weaken my chance of getting in?

Thank you for any comments!