"while I was getting more down to the page, the drop down menus were getting "shorter" and sometimes disappear at the very end. I tried it to many pages to see if it was happening everywhere and it does. I don't know exactly how to describe it that's why I took screencaps from the page. All three are from the same page, in different height. See how the drop down menu of "more" can be seen entirely at the top of the page and how it gradually disappear as I get closer to the bottom. It's really weird!! The same thing happens when I am trying to add a wiki link in the article's text and to be honest, that's how I notice the gradually disappearing."
The screenshot is at [[File:Drop Down Menus.jpg]]
I can reproduce this in Firefox 24 on Linux when using the vector skin, but not when using Monobook.
Trying to add a link after the end of the first paragraph I get no suggestions when my window is not maximised. Even when it is maximised it has completely disappeared by the end of the page.
What seems to matter is where the view is, not where the cursor is.