Ahh ok I see now.
Even though you have a nofollow on your link in the navigation from your url to your wiki, the pages will still be indexed! Even if the links are not being followed by search engines they are still being indexed by them-just want to make that clear. Also, it's important to note that even if Google reads a nofollow tag they still have an option to follow it anyway. Because of the open source platform you are using, I'm not sure if there's a way to stop the crawl from indexing the link between your url and your wiki. That might take some fancy foot work. That would be the only way to get the nofollow percentage removed…but you really don't want your wiki pages to not be indexed anyway.
Moz is reflecting what the crawl bots see…such as Google. You can't tell it to not show you certain things unless you alter your code, .htaccss, or robots files to change the way the site is being crawled.
As I stated earlier…having a lot of nofollows doesn't necessarily hurt your SEO, but it will not bring you the benefits of followed links that pass link juice and page rank.
I understand it's hard to see the real issues to address when you are flooded with this other stuff, but I'm not sure you have many other options unless you want to remove the nofollows.
Just curious…why do you use so many nofollows anyway? Or is it automatically generated by wiki?