[fixed]Urban Burgeoning no untap land if no card untaps

Describe the Bug:
AI had Urban Burgeoning on a land and it didn't untap on my untap step for 3-4 times and did untap on a couple of others.Is it optional for AI or something?
Which card did behave improperly ?
Urban Burgeoning
Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/08/07: Eldritch Moon, duel
What exactly should be the correct behavior/interaction ?
Urban Burgeoning always untaps enchanted land on opponent's untap step.
Are any other cards possibly affected by this bug ?
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AI had Urban Burgeoning on a land and it didn't untap on my untap step for 3-4 times and did untap on a couple of others.Is it optional for AI or something?
Which card did behave improperly ?
Urban Burgeoning
Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/08/07: Eldritch Moon, duel
What exactly should be the correct behavior/interaction ?
Urban Burgeoning always untaps enchanted land on opponent's untap step.
Are any other cards possibly affected by this bug ?
-