All the ones I have found say 2100 on the packaging, but 1900 on the batteries.
Same with me. I bought about a dozen packages and noticed afterwards that they were actually labelled as 1900 on the batteries. Checked a few other places afterwards and they were all the same. Contacted UniRoss by email, they said they'd look into it and get back to me, but they haven't. Also bought energizer 2450 at the same time and they seem to work better in a flash.