Cf bug or lag?

So I started playing cf again but there's this annoying thing that happens when I try cast cf, this blue question mark appears above my head and doesn't allow me to cast, but consumes 400mp still.
So basically all battle I can't cast cf, I'll click and click but get the same question mark until all my mp is drained and doesn't matter what range I am either.

Anyone know what the issue is? My connection seems fine so i don't why it keep happenings to me or am i doing something wrong?

 

you are double tapping cf button somehow.
this happens when you release cf at 0 charge

 

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Hmm I'm tapping once, maybe my phones screen protector is making it double tap. I guess I won't play cf anymore xD
No idea how to fix it. Thanks anyway

 

you can confirm the double tap by placing the gsw or quick aura on cf's place
if it's not double tap then I don't know what the problem is

 

Alright thanks I'll test it out.

 

I think you can prevent the CF double cast by setting both of the charge phase and cast phase in a combo, that way the one being double casted is your combo opener, tho that's if the problem is actually the double cast

 

Yep that's what I had to do. Works now but still a lil annoying xD thanks