A character's Command is not responding properly

[Asef Hassan Amiz]

My Greetings everyone,
I have this Mugen character called Demitri and there is this Move that he has which is very powerful
Since the button combination for that move is difficult, i edited it's .CMD file by changing the button combination of that move into "a" button simply
But during the gameplay the move doesnt work simply by pressing "a" button
but Instead the move works if i Hold "down" and release it while instantly pressing "a"
So why doesnt it work simply by Pressing "a" like all the other characters ?
I really want to make the move work simply by pressing "a"
So can anyone help me with this ? someone please tell me where am i screwing up.
Please help & thanks everyone

[Cyanide]

command = a

That's all you need. If it's not that we need to see what you have.