I noticed a difference between my power curves for this season (2021) on Strava and on intervals.icu. When I compared trainings there is a significant difference. See screenshots (same training, different curve)
Other seasons have the same curves on Strava and intervals.icu, so I really have no clue what the reason is.
You have a few recent rides with clipped power spikes (little orange bolt icon):
And note under the chart:
Also orange dots/lines on the power trace. You can click the note to adjust the detection threshold:
But I think your FTP might be set a bit low. Even with the spike clipping Intervals.icu thinks it is quite a bit higher than you have set.