@Bill Thanks for the reply.
I think I solve the problem with my code. If anyone has the same issue I changed the code to this →
void APlayableChar::DoubleJump()
{
if(JumpingCount<=1)
{
ACharacter::LaunchCharacter(FVector(0.0f, 0.0f, 500.f), false, true);
JumpingCount++;
}
}