Ha you caught me with that one. I found the 3 straight away, saw it was 6 went back studied real hard and could still only find 3.

Then looked at the answer went back found the original 3, then found another one before losing it and wandering if it was some kind of optical illusion.

Now after looking a third time I see it was no optical illusion at all and that I am indeed dumb

I owe you another cc in 24 :P