Apple Watch Fitness App Overreacts

This is not that big an issue, but it is annoying to me. I have my fitness app setup to display split pace and average pace. My goal is 15-min/mile for a decent walk and I use that data to help pace myself during my walk. The other day I noticed that if I stop for a car, or to tie my shoe, or whatever, the split pace goes up as one would expect. But the average pace goes up as well - a lot. For example, if I am at a 15:12 avg pace and stop for 3-seconds, the avg pace will go up into the 16's or higher and even though I get right back into the exact same rhythm and pace as before I stopped, the avg pace will end up significantly higher than if I had not stopped. I just can't believe that stopping for 2 or 3 seconds can change an avg pace from 15:23 to 15:52 over the course of the mile.