Hio,

I put my legendary golden axe (legacy item non enchanted) to market and its tier dropped to ordinary in couple of days. Prolly during server save or after server restarts.

i went to make an buy offer to 5kk for a death knight boots legendary and the market instantly sold me an epic for 3kk

Well. The item eventually reverted back to legendary once being withdrawn from market couple of times. Weird times lads.