Command Blocks outputting signals with invalid comands

I made a Mutation system that interferes with my Vampire System and when I typed in "e" in the command block it still output a signal, even without a power source powering the block

How to reproduce:
1: Create a System that gives the player a constant effect
2: Create a System that removes the constant effect, make the timer for this one a hopper timer
3: Remove the hoppers behind the first comparator
4: Remove everything except 1 character in the Command block
5: You get a powered comparator without commands or power from the Command Block