State change on Agile Board fails but it works on Issues board

Hi guys,

When I try to update State of my Story Task on Agile Board, it gives me error "State Expected : Failed".
If I go to Issues board and do same thing it works. Is it a bug or is there anything I am missing?

I designed my workflow and there is no problem with state transitions. If I had problem with my workflow, it wouldn't change the State at all. But it is changing when I do on Issues board but it is not working when I update on Agile Board.\

Thanks