Hi @panjak,
If you type the word "official" on the site it will strip the ff from the word and leave only oicial.
Development mode is turned on so we are using the .less files and css optimization is disabled by default because of development mode being turned on.
Stripping: http://prntscr.com/s09p3g
Non-Stripping: http://prntscr.com/s09pgv
The odd thing is that it is being stripped in the frontend display, but when editing the text, in the text box it isn't being stripped as seen in the screenshots above.
James