Note that this is mainly an issue due to Issue 257924 (https://fogbugz.lonewolfdevel.com/default.asp?257924_kortm3otrv20vbvr), but if you delete a Device or power that's referenced for Close or Ranged combat skills, it leaves an undesignated row. Due to Issue #257924, if there's another row above that with a valid target, it gets counted twice.

To replicate, add two Close, or two Ranged, powers to a character, and make the same skill account for both. Delete either one and you will see the undesignated row. Delete the second one and you'll also see #257924.