Under the hood, the “explosion” effect actually creates several clones of what is being animated and applies effects to them. These clones are attached to the end of the root element <body>. It looks like your CSS has a font-family, defined in div #center_wrapper, which does not apply to clones, so they appear as unallocated text by default.
The font definition on bodyinstead worked for me. Did your browser cache old CSS?
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