for i in `seq 1 100`; do curl 'https://www.random.org/integers/?num=1&min=1&max=100&col=1&base=10&format=plain&rnd=new' ; done
I got four 24s and four 62s, but only one 66. It's pretty obvious that OP is not on to something suspicious about that particular number.
Yes, because I got all of them!
I suspect you're biased towards making a note of the number 66 when it comes up, and that it's not coming up more often than other numbers... Is it your favorite number, or significant to you in some other way?
Uneven distribution seems like a sign of a good random number generator.