That was my mistake certainly

When I was filling the form for the residence permit in Geneva, there probably was a field about arrival date and I probably thought it was arrival date to Switzerland and therefore put my arrival date to Zurich in 2009.
So, I was registered as arrived in 2009.
Now I have to go to the migration office, proof that I moved to Geneva only in May 2011 and make a new residence card. But tax people did not want to extend the deadline. They won't change anything until I get the official documents from the migration office
At least now is clear why they have requested the tax return but remains just one question.
It appears that it was absolutely fine for the migration office that I have arrived in 2009 and first time registering in Geneva only in 2011. Did they think I was an illegal immigrant during all these years ?
It is certainly my fault, I admit it, but people from immigration office, dealing with my papers ,could notice it and ask for corrections. Or they should have named the field as "arrival to Geneva". Then I would not mess the dates up.