Unexpected results in editor when I change the font

Hello,

I am using Windows 7 64-bit. I downloaded PyCharm trial and started simple Django project. Everything was fine, but when I tried to change the font of the editor to Inconsolata, I got unexpected results. I am using the same font in other programs without any problems.

Before font change:

And after font change:

I am not sure where is the problem.I have never encountered anything like this before.

Any help would be appreciated.

Thanks