The attached demo report illustrates cascading parameters, where data is obtained from AdventureWorks database. the report can be previewed in the Standalone Report Designer
of R3 2016 or later. Parameters work correctly.
It looks like the controlling parameters have default values. Please debug the data-retrieval method of the last parameter and if it gets suitable data based on the values passed by the controlling parameters.
In order to provide you more accurate suggestions, please post the report definition, allowing us to create a demo report locally, or open a support ticket and send us the report, including the data-retrieval method and test data.
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