Hi,

You can specify "unfiltered" in your subscription;
otherwise some filtering is allowed by the interface contract and there are a few corner cases in which it can occur.
Note that unfiltered only makes sense if the average update rate from the Data Adapter is low.

To ascertain that the filtering was justified, we would like to see the details of the subscription operation.
They can be collected by setting LightstreamerLogger.requests and LightstreamerLogger.subscriptions at DEBUG level.
The best conditions are if you manage to reproduce the case on a dedicated Server instance;
but it is enough that you can ensure that the involved client is the first one that subscribes to the involved item.