For some reason, the optimizer is giving me wildly incorrect values for how much I have spent on each building type, in the octillions and nonillions.
This bug also shows itself when calculating the total cost to purchase a locked building when more buildings are required to unlock it; with 215 cursors, the optimizer was giving a total price to get Sextillion Fingers upgrades in the 100 octillion range (instead of a couple dozen quadrillion as it should have been).
Because this only recently surfaced as of the holiday update, I suspect it may have to do with how the upgrade and building price reducing effects are calculated within the optimizer.
A screenshot is attached. The final column displays the bug.