Making a stamina bar but he progress bar isnt going down or up

im making a stamina bar and the blueprint is all right (i think) because ive done it 3 time following a tutorial. When I get ingame, my character sprints and slows down when he runs out but the progress bar just blinks white for a split second and doesn’t actually go down when im sprinting

P.S.
I’m very new to unreal (game engines in general) and i’m making a game for a school project and its not going well… xD