Paginated report fetches all data - ignoring parameters

I have a paginated report that takes user input from a parameter (clientID) and then this value is passed in the where clause in my dataset.

The reports runs instantly in Report Builder, but when I publish the report to the Server and run the report in the app, even though I input the clientID as a parameter, it continues to fetch all data - I'm only expecting the report to retrieve one report for that particular clientID.

Any ideas on a solution?