Nice video. I have some to post later on when the weather permits.
:)Your bees are orientating to their new SBB and it looks like some young bees are out for their first orientation flight,s.
It does not take much to throw off their flight pattern.
The orientation flights will settle down after a few minutes whereas robbing will intensify!
If robbing is a potential problem I would inset the entrance reducer. (the wide side.)
Ernie Lucas Apiaries