I'm using a font that displays letters in a random way (not limited to uppercase and lowercase) and I'm not able to understand why.
In the following images, the same uppercase G is rendered differently at different positions:
Try it yourself here. (select the web font variant)
I'm using Ubuntu and I tested it on Firefox and Chromium. In fact, the same behavior occurs in LibreOffice Write (after installing the font locally).
How is this done?