The "Class: ARC" was a typo on my behalf. The immigration officer did write "ARC". The only part that I was worried about was the "Until: 1 month" part of this writings. From CRS's response below it appears that this "1 month" means the time that I had been out of country. It matches with my repsonse to the immigration officer when he asked me how long I had been out of USA for which I said close to 25-26 days.