I'm using mekanism cables.
It's already an insanely high power buffer but it also seems to be displaying incorrectly

It's already an insanely high power buffer

See also #1137
This can be fixed by going into the Hostile Neural Networks config and reducing the value of Sim Chamber Power Cap to a more reasonable value. The relevant line in the default config is: I:"Sim Chamber Power Cap"=2000000

but it also seems to be displaying incorrectly

Please update Hostile Neural Networks to version 3.2.0 or later here: https://www.curseforge.com/minecraft/mc-mods/hostile-neural-networks/files/3877903

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.