[Plugin: Contact Form 7] Validation errors:in same site 3forms work, 1not

Greet from Italy
I added 4different forms here:
working -> http://www.formulabenessere.com/home/formula-benessere-contatti/scrivi-a-formula-benessere/
working -> http://www.formulabenessere.com/home/2010/01/realizzazione-siti-web/ (different email destination)
working -> http://www.formulabenessere.com/home/2010/01/polizza-responsabilita-civile-istruttore-e-personal-trainer/

not working -> http://www.formulabenessere.com/home/2010/01/affiliazioni/
which code is

[edit: code block deleted as per the forum guidelines, please use http://wordpress.pastebin.com ]
Can’t understand what’s wrong: is there a max limit in the length of forms?