jsf messages enqueued and not display - validation

Question

I have a jsf Form with fields, submit and messages for it
<h:form id="loginForm">
<h:outputText value="Введите логин и пароль:"/>
<h:panelGrid columns="2">
<h:outputLabel for="email" value="E-Mail:"/>
<h:inputText id="email" value="#{sign.email}" required="true" requiredMessage="Введите e-mail" validatorMessage="email должен быть вида abc#abc.abc">
<f:validateRegex pattern="[\w\.-]*[a-zA-Z0-9_]#[\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]" />
</h:inputText>
<h:outputLabel for="password" value="Password:"/>
<h:inputSecret converter="pwdConverter" id="password" value="#{sign.password}" required="true" requiredMessage="Введите пароль"/>
<h:commandButton action="#{sign.doLogin()}" value="Войти"/>
<h:commandLink action="/pages/register?faces-redirect=true" immediate="true" value="Зарегистрироваться"/>
</h:panelGrid>
<h:messages for="loginForm"/>
</h:form>
And it works fine: when I just click on the submit without input anything, it shows me a validation erros, but when I added a facebook-login button, I have a message in server log: Info: WARNING: FacesMessage(s) have been enqueued, but may not have been displayed.
sourceId=loginForm:email[severity=(ERROR 2), summary=(Введите e-mail), detail=(Введите e-mail)] for each field and validation messages not displayed on the page any more
there is how I added a fb-button:
<h:outputScript library="js" name="login.js"/>
<h:form id="loginForm">
<h:outputText value="Введите логин и пароль:"/>
<h:panelGrid columns="2">
<h:outputLabel for="email" value="E-Mail:"/>
<h:inputText id="email" value="#{sign.email}" required="true" requiredMessage="Введите e-mail" validatorMessage="email должен быть вида abc#abc.abc">
<f:validateRegex pattern="[\w\.-]*[a-zA-Z0-9_]#[\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]" />
</h:inputText>
<h:outputLabel for="password" value="Password:"/>
<h:inputSecret converter="pwdConverter" id="password" value="#{sign.password}" required="true" requiredMessage="Введите пароль"/>
<h:commandButton action="#{sign.doLogin()}" value="Войти"/>
<h:commandLink action="/pages/register?faces-redirect=true" immediate="true" value="Зарегистрироваться"/>
</h:panelGrid>
<h:messages for="loginForm"/>
</h:form>
<br/>
<div class="fb-login-button" data-max-rows="1" data-size="medium" data-show-faces="false" data-auto-logout-link="true"></div>
<div id="status"/>