On version 37_95, there is a glitch with the non-active idea generator clipping into the active idea generator. I am not sure how this happened but even though I restarted the game, it was still there.
My current thought on how to recreate this is something to do with restarting the simulation and purchasing the ‘idea kickstarter’ upgrade and then purchasing ‘Mammal brain’ spawns the non-active brain.
However, buying ‘Australopithecus’ makes the non-active idea generator disappear
Hope you find this useful!