Lights switching of unexpectedly

I’m a relatively new Hue user, I have a Hue Bridge running 1.67.1967054020
I have a number of Hue bulbs in various rooms.
All seem to work as I’d expect. However, I have two bulbs and a Hue Motion Sensor in my hallway.
Ideally I want the bulbs to work with the routines / scenes that I’ve set up via Alexa during the day.
But at night I want the motion sensor to switch the lights on for a 10 min duration.
I’ve set two time periods one for the day and have selected ‘do nothing’ on motion detection. The second night time routine is set up to activate the the two lights for 10 minutes.
This night time routine appears to work fine.
But the issue is during the day, when the lights are switched on by my routines they switch off after 10 minutes.
As a novice what have I missed?