Issue loading Visualforce page: all queries are executed twice, what i'm missing?

I am managing a visualforce page, which on loading run all the queries twice, both queries made from the controller of the page or from the custom components. I don't understand how this can happen. We found this because we had a reached limit of the SOQL, after that we made some optimizations, but we don't understand why all queries are executed twice. The page use a lot of custom components, and I don't know if they can interfere with the page in some way... anyone had a similar experience or know what happen?

thnks in advance... Klodjan

The page is the following...

<apex:page tabStyle="Dossier_Cliente__tab" title="Dossier Cliente" StandardController="Account" extensions="CruscottoCliente">
    <c:KillerStyle />

    <apex:message />
    <apex:enhancedList height="400" rowsPerPage="10" listId="{!ListViewId}" customizable="true" rendered="{! !(bId)}"/>

    <apex:detail relatedList="false" subject="{!Account.Id}" title="true" rendered="{!bId}" inlineEdit="true"/>

    <apex:outputPanel rendered="{!(bId)}">
        <apex:form >
            <apex:commandButton value="{!$Label.SendDunningLetter}" action="{!Sollecito}"/>
            <apex:inputHidden value="{!Account.Invio_Sollecito__c}"/>
            <Br/>
            <Br/>
        </apex:form>
    </apex:outputPanel>

    <apex:outputpanel rendered="{!(bId)}">
        <div id="crabbtabs">
            <ul>
                <li style="display:{!IF( Account.Mondo_Scuola__c , 'None', '')}">
                    <a href="#tabs-1">{!$Label.ExpiredAmountsAgeing}</a>
                </li>
                <li><a href="#tabs-2">{!$Label.Cases}</a></li>
                <li><a href="#tabs-3">{!$Label.Services}</a></li>
                <li><a href="#tabs-11">Fruitori</a></li>
                <li><a href="#tabs-4">{!$Label.Addresses}</a></li>
                <li><a href="#tabs-5">{!$Label.StatementOfAccount}</a></li>
                <li><a href="#tabs-6">{!$Label.RepaymentPlans}</a></li>
                <li style="display:{!IF( Account.Mondo_Scuola__c , 'None', '')}">
                    <a href="#tabs-7">{!$Label.BalanceVariations}</a>
                </li>
                <li><a href="#tabs-8">{!$Label.Activities}</a></li>
                <li><a href="#tabs-9">{!$Label.Documentation}</a></li>
                <li><a href="#tabs-10">Chatter</a></li>
            </ul>

            <div id="tabs-1" >
                <div style="display:{!IF( Account.Mondo_Scuola__c , 'None', '')}">
                    <apex:pageblock title="{!$Label.ExpiredAmountsAgeing}" id="StackedChart">
                        <apex:pageBlockSection >
                            <c:StckdChart8Val StkData="{!StkData}" MinRes="0" MaxRes="{!MaxRes}" TopSteps="5" BottomSteps="10"/>
                        </apex:pageBlockSection>
                        <apex:pageblockSection >
                            <c:Chart2Val ChartData="{!pieData}" MinRes="0" MaxRes="100" Steps="5" TitoloGenerale="Ageing" TitoloAsse1="# Movimenti" TitoloAsse2="Scaduto €"/>
                        </apex:pageblockSection>
                    </apex:pageblock>
                    <c:RiepilogoScaduto ChartData="{!pieData}"/>
                </div>
            </div>
            <div id="tabs-2">
                <c:TblPage sObj="CredMan__Pratica__c" IdParent="{!Account.Id}" sParent="Cliente"/>
            </div>
            <div id="tabs-3">
                <c:TblPage sObj="CredMan__Servizio__c" IdParent="{!Account.Id}" sParent="Cliente"/>
            </div>
            <div id="tabs-4">
                <c:TblPage sObj="CredMan__Indirizzi__c" IdParent="{!Account.Id}" sParent="Cliente"/>
            </div>
            <div id="tabs-5">
                <c:TblPage sObj="CredMan__Movimento__c" IdParent="{!Account.Id}" sParent="Cliente"/>
            </div>
            <div id="tabs-6">
                <c:TblPage sObj="CredMan__Piano_di_Rientro__c" IdParent="{!Account.Id}" sParent="Cliente"/>
            </div>
            <div id="tabs-7" style="display:{!IF( Account.Mondo_Scuola__c , 'None', '')}">
                <c:TblPage sObj="CredMan__Storico_Movimentazione_Pratiche__c" IdParent="{!Account.Id}" sParent="Cliente" NomeParent="{!Account.Name}"/>
            </div>
            <div id="tabs-8">
                <c:TblAttUltimoAnno TipoAtt="{!TipoAtt}" LastYear="{!LastYear}" mMesiAtt="{!mMesiAtt}"/>
                <c:TblPage sObj="Task" IdParent="{!Account.Id}" sParent="Cliente"/>
            </div>
            <div id="tabs-9">
                <c:TblPage sObj="Attachment" IdParent="{!Account.Id}" sParent="Cliente"/>

                <apex:pageBlock title="{!$Label.UploadNewDocuments}">
                    <c:FileUpload parentId="{!Account.Id}"/>
                </apex:pageBlock>
            </div>
            <div id="tabs-10">
                <chatter:feedWithFollowers entityId="{!Account.Id}" showHeader="false"/>
            </div>
            <div id="tabs-11">
                <c:TblPage sObj="Servizi_Item__c" IdParent="{!Account.Id}" sParent="Cliente"/>
            </div>
        </div>    
    </apex:outputpanel>
</apex:page>

Attribution to: Klodj_Meta
This content is remixed from stackoverflow or stackexchange. Please visit https://salesforce.stackexchange.com/questions/33851