Route profile looks different during ride vs after ride

Just getting started with TrainerDay and ran into something confusing.

During today’s ride, the route grade/profile shown on screen started out normal, but partway through it dropped and stayed very low. I rode to what I was seeing on screen, and my power output matched that low profile throughout the ride.

After the ride, the post-ride chart shows tall, thin peaks in the route profile that I never saw during the live ride and definitely never felt. The ride itself felt consistently easy, which matches my power and HR.

The only thing I changed mid-ride was the zoom level on the route profile. I assume that shouldn’t affect the actual route profile, but it’s the only thing that changed.

Is the live route profile smoothed differently than the post-ride profile, or could zooming cause the route grade to be displayed incorrectly during the ride? I’m using a Kickr Core, by the way. Thanks!