Hi Tushar,
What is your backend ,if it BI then you choose Query Browser for connecting to Source of Bex Query directly which has better handling of filters/Prompts.
In your case,as Abhilasha suggested it has to populate for prompt input when you click on"Refresh All " option.In your webi report check the prompt options like unselect the option of keep last values selected and try to check it once.
Regards,
Venkat