Look at the numbers that Powermatch needs to correct. That is your offset at the start of the intervals. That is just the way the actual Powermatch works. It sort of resets at every interval start.
You should really verify your setup because 30w difference is a lot. If you can get your trainer closer to the values of the pedals, you will have a much better experience. I suspect your tire pressure is way too low because your trainer has a much higher resistance then it should and Powermatch has to correct by ~-30W. At lower power values, you may even be hitting the “floor” your trainer can handle at that specific speed and that will throw off Power match completely because it just can’t compensate.
Read through this post and follow the guidelines. It was written for a Tacx Vortex but should apply to any wheel-on trainer.
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