Your browser is probably loading in the CSS and/or image assets from it's cache of what Bootstrap v1.4 looked like, thus looking mangled when it runs the 2.0 HT

Your browser is probably loading in the CSS and/or image assets from it's cache of what Bootstrap v1.4 looked like, thus looking mangled when it runs the 2.0 HTML structure. A couple of refreshes (does Chrome have Shift + R for forcing reload without cache?) should sort it out.