I have just installed Kirigami using K2 2.6.2. My Kirigami version is 1.5, Gantry is 4.14.
I am having the same problem here. A "1" is being appended to the upper left hand corner of each K2 item. If I disable RokSocialComments (version 1.1) the problem goes away. I have tried to actually turn them on in my template settings to see if that made a difference but it did not.