WCS Webactivity not working properly for Customer segments

This problem is related to personalizationID. If
personalizationID is not updated, the activity will treat it as
same user and will be applied. So changing to a new
personalizationID is the solution. A new configuration is
introduced in instance xml. If configured, the new
personalizationID will be created in WC_PERSISTENT cookie when
the user logs off. By default, it is not configured and the
personalizationID will still be the same as original one.

To enable it, need to add "logoffRefresh="true"" element in
instance xml. See the following:
 <PersonalizationId display="false" enable="true"
logoffRefresh="true"/>