[Typo3] simple but strange

[ADavide]

Hi all,
I have a curious problem with a small ts.
I need to concat contents from all subpages and show the result replacing
two html template marks (with the same content)
only the first one is replaced ;-|

my ts code is

===============
plugin.tx_automaketemplate_pi1 {
    # Read the template file:
    content = FILE
    content.file = fileadmin/template/prova/prova3.html
    # Prefix all relative paths with this value:
    relPathPrefix = fileadmin/template/prova/
}

fullContent = CONTENT
fullContent {
    table = pages
    select {
        pidInList = this
        orderBy = sorting
    }
    renderObj = CONTENT
    renderObj {
        table = tt_content
        select {
            pidInList.field = uid
            orderBy = sorting
        }
    }
    renderObj.stdWrap.wrap = |§§§
}
# Template content object:
provaTemplate = TEMPLATE
provaTemplate {
    template < plugin.tx_automaketemplate_pi1
    marks.FIRST = CONTENT
    marks.FIRST < fullContent
    marks.SECOND = CONTENT
    marks.SECOND < fullContent
}

# Default PAGE object:
page = PAGE
page.typeNum = 0

page.1 = TEMPLATE
page.1 < provaTemplate
===============

Is there someone have some idea about this behaviour?
Thanks in advance.
Bye, Davide.