Sure sounds like a dodgy pixel. If you'd like to try a quick fix first...give the affected pixel a firm pinch, if no change, try the same on the pixel before it. Could be a marginal solder connection that just needs to be coerced into place. If that helps out, you can try using a zip-tie to keep the pixel pinched, or cut away some of the rubber insulation on that pixel and touch it up with a soldering iron.
If that doesn't help, or if you'd simply prefer a more permanent fix, a replacement can be arranged. Email email@example.com
with your order number and a link to this thread and we'll get that taken care of.