Sometimes, the nixie tube can get such an impact during the shipment to the customer that the “4” gets hooked under “3”, usually also touching “9” which is in between them. This causes all of these digits to glow together.
If such a thing happens to you, please first try to fix it like in the video below. If it doesn’t help or you damage the nixie tube while trying, we will ship a new nixie tube – in such a case, please contact us at contact@farny.cz