ERG mode confused

So I was so confused about ERG mode in iPhone and computer. My smart trainers is Magene T300.

First time I was used computer to train. I think everything is kinda okay, sometimes my signal is weird. But that’s ant+ problem. You can see the yellow line is smooth.

In few days, I decided to use my iPhone with bluetooth to train, but you can see the picture. The yellow line just up and down.

Does anyone have this problem?
How should I fix it?

It is normal as power is never smooth.

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Yeah that looks fine to me. When you see perfect intervals on other rides it’s using artificial “power smoothing.” In reality it always looks like yours.

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I understand, thank you!

Understand! Thank you!