I believe this is because “LFO 1 Amount” is for the fixed mod only. Basically it’s the amount knob for that LFO.
An entry like this, has it’s own amount (Mod 3 amount)
Mod 3: LFO 1 +127 Osc 1 Fine Pitch
To change that one, you would use
Mod 4: Slider +127 Mod 3 amount
Let me know if that makes sense, I may not be explaining it very well
