Edit 1 :
Yes , still its the same way .
I have inspected fonts :
OS : Windows 7 ultimate
Already installed and uninstalled Google chrome
Hmm, that's weird. I'm on Version 51.0.2704.103 m (64-bit) and they look fine:
As a comparison, here's IE:
All basically the same.
What OS are you on?
If you right click on the tab and choose "Inspect", what do you see by the font styles in the Computed tab?
I have font-family: Roboto, sans-serif;