You don't have the transistors wired in place yet, do you? I'll look at your video again to confirm.
If that's the case, all the Highs & Lows for pins 2-3-4 and 5-6-7-8-9-10-11 need to be swapped :
2 High turns on CommonAnode2, while 5-6-7-8-9-10-11 low would bring the Cathodes Low & make an 8 appear.
If you do have the transisters, than post the schematic, is hard to tell what you have from the brief camera glimpse.
Minor thing; you don't turn the relay off when done.