It could be a Credit card that Chase has used once they took your points.

One time I booked a hotel through hotwire and when I went to check my reservation on the hotels website I noticed that it wasn't my credit card # but it was a different credit card # (probably Hotwires cc#). As long as you have a confirmation & proof of purchase you shouldn't be worried, but you can always call chase to confirm since you booked through them.