Welcome to the world of Beekeeping. Looks n sounds like you have your family envolved too ! Starting with a pair of hives was a great choice.
Interesting both queens were not out all already. Bees will be bees ! I’m guessing you started with 2 packages of bees. I watched n didn’t see aggression against the queen. You did a good job following the clubs directions. Do you have a mentor available if things get ahead of you ? I might suggest next time just removing almost all the candy plug n giving the colony one or two more days then releasing … But you did G👀d ! When working with your queen always keep her n that cage totally over the hive. Dropping her outside the hive box can be bad news if she gets alway, lost or accidently stepped on. But congrats ! Your off n running.
One last thot on releasing… I would have rehung the cage… If the queen is not totally accept the protect warmth of the cluster might not be available. Just a thot for future times . The bottom area can be damp n cool for her magesty.
As for the leaking … Not sure with your style top-feeder but I’ve been able to swish a bit of hot bee wax around the interior n patch a quick small leak quickly (of course you have to dump out sugar water, rinse n quickly dry). Only takes few minutes if you prep ahead. I have had one that started leaking. This method was a quick fix !
Keep us up-to-date ! Enjoyed the Video. By the way where are you basicly located? It helps in extending you better advice as each region can be so different. You might go back n add that to your name n info …
Good luck n happy beekeeping bro,