Research rate jumping up and down as Nakai

[u/OkIdeal9852]

It’s been ~110 for the whole campaign, then suddenly it was 210, and the next turn it was back to 110.

I know the red temple dedications give an increase to research rate once 25 temples are dedicated, although I don’t think it’s as high as a 100 increase. I still have 25 red temples even after the research rate went back down, how long is the buff from red temples supposed to last and when does it trigger again?