what foods should spike you, but don’t?

mine is corn tortillas, I buy the regular ones ( can;t find the low carb) & they are about a buck for 10. Each one has 15 grams carbs. If I eat one at lunch or breakfast, using it as a wrap, I don;t get any spike. However, even one slice of low calorie wheat bread or thins (half of one) which wold have about 10 to 12 carbs, spike me much more.
What’s your anomaly?