I've not seen this stat before, so it could be very new, and that could be why there is this problem, but at the moment, it currently states '1' for this, on a cache where there has definitely been more than one find in a day. I have a couple of caches (not the one stated) which have at least 25 finds in a day, but it's not picked those up.
Is it a bug, or will it resolve itself over the next day or so?