Yes, I am able to replicate it using the live demos using Chrome v 53.0.2785.143
To do so, highlight a word and delete it. The design only shows one space, but the HTML shows two spaces. For example, I deleted the word 'volcano' at the end of the 2nd paragraph. Below is the design and HTML text:
Design - ...third-largest in the world.
HTML - ...third-largest in the world.
Or if you highlight a group of text, the same issue occurs. In the following example, I removed ' '
Design - ...which is located at the center of Barcelona
HTML - ...which is center of Barcelona