JSF view displaying outdated value - jpa

Question

I have two entities and a backing bean in my application. Following, a simplified version of it:
Controller and Models:
class BackingBean {
private List<A> collectionOfA;
private A currentA;
private B currentB;
private String newDescription;
// accessors
public void prepareForUpdate(ActionEvent e) {
currentA = (A) e.getComponent().getAttributes().get("a");
currentB = (B) e.getComponent().getAttributes().get("b");
}
public void save(ActionEvent e) {
// method to save b
b.setName("changing the name");
b.setSomeNumber(2);
b.setDescription(newDescription);
entityManager.merge(b);
}
}
#Entity
class A {
private String name;
#OneToMany
private List<B> bs;
}
#Entity
class B {
private String name;
private String description;
private int someNumber;
}
View:
<div>
<!-- some popup with inputs for updating B -->
<h:inputText value="#{backingBean.currentB}" />
<h:commandLink actionListener="#{backingBean.save}" />
</div>
<ui:repeat value="#{backingBean.collectionOfA}" var="a">
<h:outputText>#{a.name}</h:outputText>
<ui:repeat value="#{a.bs}" var="b">
#{b.name}
#{b.description}
#{b.someNumber}
<h:commandLink actionListener="#{backingBean.prepareForUpdate}">
<f:attribute name="a" value="#{a}" />
<f:attribute name="b" value="#{b}" />
</h:commandLink>
</ui:repeat>
</ui:repeat>
Assuming that, when I click the commandLink for prepareForUpdate(), the popup shows, my problem is this: when I save the currentB entity, every field of the entity is updated in the view. However, an instant after, the field b.description is rendered again with the old value. When I check the database, the description is, in fact, updated, as it is if I refresh the page.
Any thoughts on why this is happening?