Different riding experiences between paring ios or android devices to smart trainer?

I noticed that the resistance of my trainer would be adjusted according to the slope gradient when paired with IOS devices. However, when pair with Android devices. There’s no change in the trainer’s resistance according to the slope gradient. Instead, it reflects into slower riding speed.

Any Zwifters experience above symptom? I wonder if it’s OS or smart trainers dependent issue?

I noticed that when paired with iOS