When you go to play a spell with awaken, make sure you are in full control. If not even if you float the mana for some reason the game will use the land you want to put the counters on to pay for the awaken cost.
Happened to me in 2 different games.
The first one I just hit auto pay and selected the land and it tapped the land to pay for it while leaving 2 other MDFC lands untapped.
Second game, I floated the mana and then cast the spell and then selected the land to put the counters on and hit auto pay and it used all but 1 mana in my pool and tapped the land I chose to pay the last mana.
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