What people don't get is that when you enter a Skype, it gives you a lot of suggestions to other people, however the first person on the list is the person you're trying to add. Everyone else are just suggestions in case you mistyped the name in Skype.
If you mistype the name in Skype, it gives you the closest match it thinks is correct.
If you add my Skype (live:roomscape), the first one is me, however the 2nd and 3rd and so on are other people with similar names that Skype is suggesting in case you mistyped my name.
It's honestly not that hard to figure out. You can also right click on the name before you add the person to see their Skype name to verify whether or not they're the right person.