HDIV error in forEach inside form select

I'm having trouble trying to implement form:select in HDIV. Here's my code in the JSP which renders the selector and options:

<form:form
        modelAttribute="staffPosition" 
        method="post"
        action="${contextPath}/project/assign/staff">
        <td>
                <form:select class="form-control" path="staffID">
                        <c:forEach items="${staffList}" var="staff">
                                <c:set var="staffName" value="${staff.prefix} ${staff.firstName} ${staff.middleName} ${staff.lastName} ${staff.suffix}"/>
                                <form:option value="${staff.id}" label="${staffName}"/>
                        </c:forEach>
                </form:select>
        </td>
        <td>
                &nbsp;
        </td>
        <td>
                <form:input placeholder="Example: Project Manager, Leader, etc..."
                        type="text"
                        class="form-control"
                        path="position"/>
        </td>
        <td>
                &nbsp;
        </td>
        <td>
                <button class="btn btn-default btn-flat btn-sm">Assign</button>
        </td>
</form:form>

After I click assign and initiate the action, the request would arrive in the Controller with the correct ID of the selected form:option.

public String assignStaff(
        @ModelAttribute(ATTR_STAFF_POSITION) StaffAssignmentBean staffAssignment) {

However, when I inspected the console, there was an error: INVALID_CONFIDENTIAL_VALUE;/pmsys/project/assign/staff;staffID;27;[27, 28, 29, 30, 31, 32, 41];127.0.0.1;127.0.0.1;root

When I tried to trace the line of code which spits out the error: org.hdiv.filter.ValidatorHelperRequest:948

There was an inconsistency with the originalValue and the parameter value when this condition was evaluated: if (!m.matches() || (Integer.valueOf(value).intValue() >= stateValues.size())) {

originalValue = [27, 28, 29, 30, 31, 32, 41]

value = 27 (This is the ID number of the form:option which I selected in the JSP)

Does anyone have any solution to this problem? Could this be a bug in HDIV?

Note: This problem does not occur if I do not have a <c:forEach inside <form:select.

UPDATE: This is my hdiv configuration:

<!-- *********************************************************** -->
        <!-- *********************************************************** -->
        <!-- HDIV ****************************************************** -->
        <!-- *********************************************************** -->
        <!-- *********************************************************** -->
        <!-- HDIV Config -->
        <beans:bean id="hdivEditableValidator" class="org.hdiv.web.validator.EditableParameterValidator"/>
        <mvc:annotation-driven validator="hdivEditableValidator"/>
        
        <!-- Accepted pattern within the application for all editable parameters (generated from textbox and textarea) -->
        <hdiv:validation id="safeText">
                <hdiv:acceptedPattern><![CDATA[^[a-zA-Z0-9@.\-_]*$]]></hdiv:acceptedPattern>
        </hdiv:validation>
        
        <hdiv:editableValidations>
                <hdiv:validationRule url=".*" enableDefaults="false">safeText</hdiv:validationRule>
        </hdiv:editableValidations>    
        
        <hdiv:config
                debugMode="true"
                errorPage="/fix"
                excludedExtensions="css,png,gif,jpeg,jpg,js,woff,woff2,map"
                randomName="true"
                strategy="cipher">
                <hdiv:sessionExpired loginPage="/auth/login" homePage="/"/>
                
                <!-- Controller calls that do not have validation -->
                <hdiv:startPages>/</hdiv:startPages>
                <hdiv:startPages method="get">/auth/denied,/fix,/,/auth/login,/auth/logout,/dashboard/,/image/display/project/profile/,/image/display/staff/profile/</hdiv:startPages>
                <hdiv:startPages method="post">/j_spring_security_check</hdiv:startPages>
        </hdiv:config>

The WEB.xML

    <!-- Replace JSTL tld with HDIV tld-->
        <jsp-config>
            <taglib>
                <taglib-uri>http://ift.tt/1vL9NML;
                <taglib-location>/WEB-INF/tlds/hdiv-c.tld</taglib-location>
            </taglib>
        </jsp-config>
        
        <!-- HDIV Listener -->
        <listener>
            <listener-class>org.hdiv.listener.InitListener</listener-class>
        </listener>
        
        <!-- HDIV Validator Filter -->
        <filter>
            <filter-name>ValidatorFilter</filter-name>
            <filter-class>org.hdiv.filter.ValidatorFilter</filter-class>
        </filter>
        <filter-mapping>
            <filter-name>ValidatorFilter</filter-name>
            <servlet-name>appServlet</servlet-name>
        </filter-mapping>

and VERSIONS

<hdiv-version>2.1.9</hdiv-version>

<org.springframework>4.1.6.RELEASE</org.springframework>