If you control two Paradox Haze, you will get two additional upkeep steps after your fist one. You will first take the one created by the last Paradox Haze's ability to resolve.
Name: Paradox Haze
Type: Enchantment - Aura
Rules Text: Enchant player
At the beginning of enchanted player's first upkeep each turn, that player gets an additional upkeep step after this step.