I called up USCIS. They don't have any idea on that matter. I pointed out some document on USCIS.gov which states that if GC approves after 2 years of marriage, one should get non-conditional GC. but they stick to their point and asked me to setup an appointment with local office.
I checked my passport where the officer stamped. He wrote IR6 and my card says CR6. I called up again this morning and informed them, with my surprise they told me that officer made mistake. I should get conditional GC. If I have question, I should setup INFOPASS with local office.
I have that appointment scheduled for 24th April. Will see how it goes and let you guys know.