it can take a lot longer than the ‘bonding’ to actually establish a hierarchy, a few weeks. However a successful bonding does not mean a relationship won’t break down. A change in environment can also set off dominance issues ie they are presumably in a new cage, new smells etc.
The second video you have just posted would definitely start to concern me though. If one backs down into a submissive position (loud squealing can be a sign of submission) then they will be establishing hierarchy and that should settle things down, but if this continues and one won’t back down then it would suggest that the relationship is failing.