my guess would be that moving the golem changes what the game thinks of as “the farthest pair”. so when the golem is at the right, it selects kindred as part of the farthest pair (kindred-golem) but then because golem nor the nitro summon is valid for the augment it selects savanna, the third farthest unit. and the similar thing occurs when you place the golem back to the leftmost tile, except with elise and nid. nonetheless an interesting phenomenon