I received a BEP pack where on the back of each new bill it has this Ink smudge thingy, it almost looks like a fingerprint.
Is this an error, or just bad luck for me in having a pack of Notes with this Ink thing?

The picture is really clear of the detail, but when I reduce the size to upload it here, it gets blurry. I'll try to crop it and upload that detail

That's a little clearer, so what are your thoughts on this Ink thingy?