In the search bar in Chrome, when I start to type youtube, it will automatically give me youtube.com___ first. The first suggestion will be "youtube.com___/", and then "youtube.com__/", then "youtube.com_/", and then all the way at the bottom, "https://youtube.com".
It only happens with youtube, no other website does this.
It's very annoying as it basically makes it extremely hard to navigate to youtube, especially when trying to search it.
Here is a picture showing the problem,
This has been happening to me for years, but I haven't bothered asking why until now. I recently switched from Safari back to Chrome, as it feels more responsive, but I'm facing the dreaded youtube problem again. I can't find any other information about this on the internet.
I'm running Chrome 39.0.2171.7 dev (64-bit) on Mac OS X Yosemite Public Beta 5
EDIT: I have gone through the search engines in "Manage Search Engines" in chrome://settings. I found that a lot of websites have duplicated domains with an underscore, like "deviantart.com_" for example. I tested this by seeing if this problem happened with deviantart, or any of the other websites like this, but no, it only happens with Youtube. Youtube also had a search engine for each underscored version. I deleted all of these, but unfortunately nothing happened, the problem still remained after restarting Chrome.