Hi,
1) Did INS ask about the current employer and the paystubs at the time of stamping? if yes, did not INS raise question that current employer and I-485 registered employer are different?
==> No Questions asked at Stamping. Note: INS can only ask q. before approval. No Q. asked after approval.
2) Did you show the qc21 at the time of stamping? Does it effect anyway present and future?
===> No Questions about previous / current employment. Only things taken during stamping are Approval notice , I94, EAD , AP etc.