Bold Ob Fonts

Edit: Sorry I forgot to write [help]

OK, I've been using ObjectBar for a while now, and one thing always bothered me. My fonts are always smaller and not bold when I use Xero's themes. I can't figure out why, I went into skin studio and set the font as bold, and I have all the fonts he used. Here's a comparison:

Xero's:

Mine:

#61192