GWT - URLs missing from Content Keywords List

[onlinesource]

When I go into GWT > Google Index > Content Keywords > Choose any keyword, I see the following.

So it shows the keyword like "stuff" and the significance and that it has 3,733 occurrences. I also see the different variants encountered of it.

Below all of that is a lot of the top urls. The top URLS are listed as such:

/
/
http://www.mysite.tld/
/
/
/
/
/
/
/

Other reports I've seen list the actual url, so why does Google replace the url with just a forward slash? What causes this to happen? Does anybody know.

If I put my mouse over the forward slash, I can see the actual link in my browser like mysite.tld/about-us but on the surface, it's listed as just a "/"

Is there something in the source code that pulls the page's url? I was curious if something was broken?

[edited by: Robert_Charlton at 3:58 am (utc) on Jan 7, 2016]
[edit reason] delinked sample domain [/edit]

[JS_Harris]

I'm pretty sure that page just reports on number of times the keyword appears. The pages being shown first all have the most mentions of the word even if they aren't the best page for that keyword.

[onlinesource]

Ok, but why would the links appear as just / and not the actual name of the url. Is this a problem? Like Google is saying we don't know the name of the url so we just call it /?

[rainborick]

I spotted several strange URL fragments displayed in this list for my site, but it was only the displayed URL that was incomplete. The actual link to the page in question was correct, so you can find the complete URL if needed. It's apparently a URL-shortening scheme to allow very long URLs to be shown in a compact format. The '/' references I saw were to subdirectory root URLs, which makes some sense from a programmer's standpoint except that they would be much better if they included the actual subdirectory name.