Sorry the one I wanted to change was actually the article that was attached to that category. yokosphotoworld.com/development/stonecircle/index.php/materials/item/389-verde-tropical-g
The item isn't on the menu and I've not changed the menu for the category. I'm at a loss as to why it hasn't changed, unless it is something to do with the multiple extra fields for k2 extension that I installed. It doesn't appear to have any code that would change the title but I'll ask the developer just in case.

I've solved it - it was a filter extension that I had in that had its own language file. Sorry to have bothered you.

Thank you for sharing the solution :)
Which extension was it? In case other users run into the same issue.

Krikor wrote: Thank you for sharing the solution :)
Which extension was it? In case other users run into the same issue.

It was Filter for K2 by StyleWare

Awesome, thank you so much for sharing this.