Exit any tutorial video fullscreen mode jumps to page top

[afpr252]

In the tutorials page, every time I play a video and select fullscreen mode (in the YouTube button) and afterwards exit fullscreen mode (in the YouTube button or ESC key), the page is in the top, instead of being in the place before I select fullscreen mode.

I'm using Google Chrome version 41.0.2272.89 (64-bit) in OS X Yosemite (Macbook Air Mid 2013).