I have made some spells based on Candlelight and Magelight and the durations of 60 seconds becomes 90 seconds, 30 seconds becomes 45 seconds etc because my character has the Stability perk.

This applies to the standard Magelight and Candlelight spells - the duration of the light ball is 90 seconds.

But with my custom spells, the light ball persists only for the base duration while any secondary effects like scripts persist for the full extended duration.

What have I missed? The spells are Adept, Expert and Master and are set at those levels.

Why does the +50% duration from Stability not apply to the visual effects?

Cheers!