That looks like a computational error with the explorer, rather than something amiss in the blockchain (going by what I’m seeing in @backpacker’s replica).
I wonder if blockexplorer.nu was on a different chain at some point way in the past (now reconsiled) that didn’t get flushed from the database. The address in question appears to be missing the early transactions that funded it with the ~2.5M NSR.
@JetJet13: Any speculation as to what happened?
