Few days ago I appeared in a postdoc interview. The PI was very much impressed with my resume and the interview went very well. The PI asked me when do you want to join. The next day he asked recommendation letters from two of my references (I am sure that they will give me a very good recommendation). After 2 weeks I got the rejection letter. How to interpret this rejection (he told me that the position is filled by some other candidate). This will be useful for my future postdoc endeavors.
I politely asked him the reason. He did not reply.
Thanks in advance. Sorry if this question is inappropriate.