Vim folds acting strangely

In this document/text:

http://pastebin.com/DQm580JF

If I fold the last item, only it gets folded. If I fold the last but
one, the two last get folded... If I fold the first item, all items
get folded.

I'm using the usual foldmethod=marker foldmarker={{{,}}}

Any ideas?

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