I found a weird bug, and srjek helped me verify it. 

Here is the bug:

Two players send out cute little claim robots to claim a geothermal vent. 

While the robots are on their way, the player whose robot will arrive second, sends out a geothermal plant to be built on the spot where they will not get the claim.

When the first player's robot gets there, the second player's robot will cancel, but the geothermal plant will STILL fly, and will in fact BUILD on the claim.

The geothermal plant is intractable by the first player, but the second player gets the power that the geothermal plant generates.  The first player can then scrap the second players geothermal, and rebuild, and the plant will then belong to him.

Here is a video of us reproducing this bug:

 I am not sure if this bug is only with geothermal, or happens with other tile types as well.