Custom font disappears after a while in Xcode 6 UI Builder

I don't know if anyone has this problem in Xcode 6, but whenever I add a custom font to the UI designer and change the text or label size, the font changes to the system and custom font diapers from the list. I need to remove it from my project and add it again to Supporting Files so that it appears in the list again.

Is it just me? or has someone encountered this problem?

(I added the font to info.plist too)