CBSA agent may not have submitted your PR card application after realizing he couldn't use your US address. Many refuse to submit your PR card application if you aren't remaining in Canada.Thanks for the link. I tried linking PR Card application exactly as mentioned in the post, didn't work. Tried different combination for place of birth according to comments, that didn't work as well. I will call IRCC.
BTW, I applied SIN number and received it to my US address. I'm hoping there is no issue with PR card.