I had this happen when doing a label thru Ebay the other day, but not directly with the click and ship website. What I did notice on their site, when shipping a couple passes is its adding a signature required to the label even though I don't pay for it and didn't request it. The post office called me out on these and said they are seeing it everywhere. I PM'd Longhorn who got a notice to go pick up a box at the PO, and said he saw that on a label he created as well. They are having some glitches with their site.
Funny thing when I talked to the Post Master she said "It's the post office and it could take them forever to fix it". I thought that was pretty funny of her.