Light Weight Poller (LWP) is an option on a device application that polls for Unwired Server push synchronization notifications at an interval. This LWP mechanism is not compatible with device tracking in a clustered environment.
With push synchronization, Unwired Server is designed to notify mobile clients of changes made to the cache via a data change notification the server receives from the EIS server. On Windows clients, device-tracker gateway is configured and enabled automatically.
You must make changes on the Unwired Server and Windows device clients to resolve this issue.