Shaft in Nanowavebox pump

[Frozenocean]

I have a quick question.....should the metal shaft be attached to the Nano Wavebox pump....the impeller should obviously be able to slide on and off

THe reason is my wavebox will run for awhile and then I have to tip it back to restart it for lack of a better term...

I noticed the shaft and a "ring" on the shaft seem to be free moving.

Thanks

Tony