Fields are cleared but just when I press F5

I don't know if it is a common problem, but this strange problem is giving me some headache... I'm having an strange behavior, my application has a lot of dialogs, and when user opens one, the dialog should show default content. The problem is that I clear all bean's properties before show the dialog, but sometimes it appears that the form isn't cleared!! For example, this is one of the dialogs that are having this problem:

This image show how the dialog appears the first time I open it, all fields are cleared and the second radio is selected. If I change the radio selection and enter something in the input field, the datatable immediately shows the data accordingly with the search. So, if I click in "Cancelar" (cancel in portuguese), this dialog is closed, like expected.

Then I open this dialog again and:

The fields store the last edition user made. I thought I wasn't clearing the bean, but if I just press F5 (refresh) the dialog is shown like in the first image. I don't know why, but some fields aren't updated!!

My dialogs are created using this template:

<ui:component>

<hrgi:popup id="#{idPopup}" titulo="#{titulo}" renderizar="#{popup.visivel}"

            bordaConteudo="#{bordaConteudo eq null?true:bordaConteudo}">

    <f:facet name="cabecalho">

        <ui:insert name="cabecalho"></ui:insert>

    </f:facet>

    <f:facet name="conteudo">

        <h:panelGroup id="#{idPopup}Conteudo" layout="block" style="width:100%">

            <p:focus/>

            <ui:insert name="conteudo">Nenhum conteúdo definido!</ui:insert>

        </h:panelGroup>

    </f:facet>

    <f:facet name="botoes">

        <h:panelGroup style="width:100%">

            <h:panelGrid id="#{idPopup}PainelMensagens" style="width:100%">

                <p:messages/>

            </h:panelGrid>

            <ui:insert name="barraDeBotoes">

                <h:panelGroup layout="block" style="width:100%">

                    <p:commandButton value="CANCELAR" styleClass="hrgi-botao-popup"

                                     immediate="true" update="@form"

                                     action="#{controladorPopup.fechar}"/>

                    <p:commandButton value="OK" styleClass="hrgi-botao-popup"

                                     action="#{controladorPopup.submit}" update="@form alerta #{atualizar}">

                        <f:param name="REQUIRED" value="true"/>

                    </p:commandButton>

                </h:panelGroup>

            </ui:insert>

        </h:panelGroup>

    </f:facet>

</hrgi:popup>

</ui:component>

is my own dialog component...

Could someone explain me why it is happening??