I am watching some arena replays of higher rated players in games and noticed when I inspect them their gear is really strange? Like they have level 60-70 items on in some slots and wrathful in others.... it looks like maybe this is some kind of spectate bug? I am just not sure...
When spectating arenas, the items display on inspect are the transmogs base items (those lvl 70 items you talk about) instead of the item they use.
Probably a bug that doesn't deserve/too hard to fix on a feature that is not that much used across the 3 servers (My opinion, i have 0 data for this).
If you want to inspect them, you can go on warmane website -> armory. The right items will be displayed. There is your easy fix, bar a few clicks.