seam action method executed twice?

Question

I'm currently working on a seam project and have a problem.

I just created a new page (an xhtml called MyPage.xhtml). In xhtml my code you can find a command button and a a:repeater to display my data:

<!-- input fields that are filters for my table shown below -->
<h:commandButton value="View details" action="/MyPage.xhtml"/>

<rich:panel rendered=#{myAction.showDetails}>
    <a:repeat value="#{myAction.findRecords()}" var="record">
        <!-- Some of my code to display a table, nothing fancy -->
    </a:repeat>
</rich:panel>

in my action I have this:

@DataModel
private List<MyEntity> records = new ArrayList<MyEntity>();

public List<MyEntity> findRecords() {
    //Do some query
    Query query = entityManager.createNamedQuery("myEntityQuery");
    records = query.getResultList();
    return records;
}

This is how the page works:

1. my input boxes and command button are shown, not the rich:panel as my showDetails boolean is false.
2. When the showDetails boolean is set to true the panel is shown and the iterate calls my action method findRecords(). So far so good!
3. But when I click my action button again the action method findRecords() is executed twice. And here's my problem...

Why should it be executed twice? How can I limit it to once? Now it costs us a lot of performance..!

Kr,

Dirk