One month in, legion still not properly scaled

I just ran Siege of Boralus heroic with two level 60’s. They both had ilvl’s in the 170’s. They saw the mobs and bosses with the same amount of health I did, and they absolutely blew up the dungeon while taking almost no damage. I was resto but I felt like a third wheel, I mostly just had to heal myself. The important part: the mobs were NOT scaling past level 50 for them…for every boss we compared how much health we saw on them, and they saw the same thing my level 50 did.

(I wasn’t on this toon, I was on my alliance level 50 shaman that I am keeping locked at 50 for now.) So…is this broken or not? The 179 windwalker monk said he was able to solo normal Uldir up to G’huun (but wasn’t quite able to beat G’huun yet).

Also…both of the level 60’s said they were able to get Legion stuff down in a couple rotations, and they were able to solo Legion mythics. Based on what we did in that dungeon, I believe them. They also said this all was broken recently but had been fixed. So what’s going on? Is this broken or not?