Lighting bug

the lighting went really weird on my generated LOD and i tried going through all the settings to fix it. This problem (see picture) doesn't occur when it is rendering in 1 block, but was appearing when i rendered my LOD in 2 blocks, it isn't the ambient occlusion, at least not not distant horizons version of ambient occlusion. also before anyone asks, no, it isnt different biomes. oh and i didn't get any error messages either