Build Number v.1.10.2 17427.2176637
When the cooldown for the deeproots reduces the timer to less than 1 it underflows and makes the cooldown jump to 1203680692 turns. The only way to fix this is to edit the save game or not use the deeproots.
Use the deeproots while having the cooldown reduced to less the 1. The next turn the deeproot cooldown will show 12... and will never go lower (unless you play 100 mil turns).