I’ve looked back on your other post as well.
I see I asked what your cage size was in your other thread but you didn’t give any measurements. If you could confirm the measurements for your cage, then that can help give us a bit more insight.
It seems you got them from a private seller. The issue is that some people are economical with the truth - rehoming due to piggies being unwell but not telling the new owner; rehoming them because their bond is failing but the original owner doesn’t mention this so the new owner finds themselves in a position where the piggies actually don’t like each other
As i say, you need to upload any video to YouTube first and then post a link to it here. We cannot host video directly onto the forum.
Obviously until we can see a video, we can’t comment in detail but If there is an issue and this isn’t normal dominance (bearing in mind sows come into season every 15 days or so and during this time you will see an increase in dominance, then a temporary separation followed by neutral territory reintroduction to let the piggies make up their mind about whether they want to be together