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zbrush max 2009 problem exportation

hello,
i have a problem with the exportation zbrush to max.

i have a model with 1561 vertex in zbrush.
i export this model to have one obj.
when i import to max 2009 i have one object with the exact
number of vertex. but when i transform this model to editable poly
i have 1562 vertex.
why???
when i change the uvs and i want to export tne model from max 2009 to zbrush,
zbrush say me wrong vertex number…

i hope you understand me.

thank you for reading and helping.
see you