Breakfast boluses

I have checked my morning basal rates for my pump and they appear to be spot on. However, when I eat 35g of Oatibix for breakfast I only need 2.5 units of bolus to cover this.

Sometimes I will have Fruit& Fibre and again i don't need as much insulin to cover the amount of carbs.

Wondering if this is a common thing?

I have also just joined https://www.logforlife.com/ an online site where you can plot your bgs and doses.