I was curious why some of my arena teams were not showing up on the arena ladders, and then it became quite obvious what was going on. Currently, it seems that the armory ladder page does not show arena teams made before MoP.
And while your "old" arena team gets a ranking #(based on what you were for the tick over of the previous week), the ladder page does not seem to respect it. And instead of leaving that ranking spot blank, it will show another team in that place(before anyone even has a chance to play and change the ladders up).
This also begs the question that if it is not fixed, would it mess up end of season rewards?
Hopefully this is a known bug and will be fixed soon. As it has been messed up since the start of the season.
And if it does not get fixed, it would be nice to know if I should remake my team sooner than rather later(assuming it would actually mess with end of season rewards).