Hi Emma,
Based on what I read, it sounds like it may be a matter of changing up your Category Listing Settings. I can't say for certain without seeing it for myself but it could be your Category Settings. In the Category settings you have
- Leading
- Primary
- Secondary
Depending on how many articles you have posted, the reason you are seeing two of the same items is because you have very little content or possibly just the one article that is showing up twice.
If all three listing settings are set to display 1+ items, try setting "Leading" to 0 and "Secondary" to 0 one at a time and see if that fixes it.
If you have a link and contact details (Skype), I can try assisting you further with this if you want.
Thanks and Good Luck!
Chris