see the attached sample application. When compat components are on the same form and both have partialSubmit="true", the valueChangeListener is firing when it is not the capturing component.
In the example:
          <ice:selectOneMenu id="menu1" value="#{testBean.menuValue}"
                 valueChangeListener="#{testBean.valueChangeMethod}"
                 partialSubmit="true">
                <f:selectItem itemLabel="Value 1" itemValue="1"/>
                <f:selectItem itemLabel="Value 2" itemValue="2"/>
                <f:selectItem itemLabel="Value 3" itemValue="3"/>
            </ice:selectOneMenu>

            <ice:selectBooleanCheckbox id="chk1" value="#{testBean.radioBool}" partialSubmit="true">
                
            </ice:selectBooleanCheckbox>
...
are in the same form. On initial page load, the submit of the checkbox will fire the valueChangeListener of the selectOneMenu (and it should not).
The customer is stating that this is happening quite often for them (the test case, it only happens on page load), but hopefully fixing this test case will also fix the customer's issue.