Active calories during the day mismatch

Hello,

I wonder what is going on for my active calories on 30 April. According to the Calories In/Out summary for the day, I burned 478 active calories during the day.

However, I have done a ride which in the details shows 1132 active calories. I've also done 2 other (short) rides during the same day, adding further active calories.

Why are the active calories for the day so lower than the active calories of one activity during that same day?

The heart rate graph for the day also shows the rides are captured and correctly placed. 

If it matters, I recorded the ride with an Edge 840 connected to a chest strap (hence HR is precise), and I wear a FR965 throughout the day.

Thanks!

Matt