Basically plated a sugarcane 4/4/4 on sand, places double crops next to it and got after a while a 2/2/2, tested a few times with it - same result, tried to do it with the 2/2/2 - 1/1/1 came out

Version : Agricraft 1.3.0alpha1

Only one crosscrop next to a crop?

Just a guess, but I'm guessing this new config option:

On a mutation the stats on the crop will be divided by this number [range: 1 ~ 3, default: 2]

I:"Crop stat divisor"=2

is probably unintentionally taking effect on spreading instead of only on the intended mutation.

Yes only one crosscrop

Yes it is like @thephoenixlodge said, I added in a divisor on mutations, however I seem to have fucked up and switched the logic (https://github.com/InfinityRaider/AgriCraft/blob/master/src/main/java/com/InfinityRaider/AgriCraft/farming/mutation/MutationHandler.java#L153). Fix imminent