Not to sure whats going on here but suspect a bug.
According to this image i have +12K with a +24K buff on my water mill and a +4K with my lvl 2 wells so according to this i should have an intake of 40k but only have 28k
I guess this is a bug that needs to be sorted so just reporting it.
I have also noticed that all buffs in the Economy View are wrong aswell
Bommer