Judging by your video, there's probably nothing wrong with your Space – it is sitting at about 49.5, and circuit noise is making it flicker between 49 and 50 – this is mainly a display effect and can probably be ignored. You may find it distracting, however.

If you move the knob to other positions, does it still happen ? If it happens on all values, it may be a dirty pot or a fault in the circuit that reads the pot. I don't think it is the ribbon, but if you can fix it, well and good.