I recently changed jobs and had to file for H1B transfer. I had less than 1 year left out of my 6 years. I don't have a perm application pending for more than 365 days nor do I have a i-140 approved. Basically I have never started a GC process but my H1B approval notice says that my H1B is extended for 3 years. Is this common or is it a mistake on USCIS part? And I am planning to go for stamping in couple of weeks, what should I do?