When you choose some civ in ranked lobby, and you go technology tree, you always have choosen Aztecs !!! You need choose all time when u go to technology tree there civ which u would like to view.
What u can do ??? When u have selected civ in ranked lobby and you go to technology tree you should see technologies for choosen civ, not for Aztecs !!!
ps. there are many more bugs in game, new update = alot of new bugs !!!