Zones in Power Distribution don't match FTP-based zones

The toggle power zone colours that can be overlaid on the power distribution summary from any given workout don’t seem to be right. My FTP is correct (I checked) but my distribution would show my Z4 to be around 150w instead of 240w.

Someone else I follow with a 320w FTP has a similar issue with his workouts, it looks like his is about 200w:

Any reason why these are so wrong? The HR zones/colours seem to be fine.

I’ve seen exactly the same here - FTP of 247W, but everything over 174W is being marked as Z6…

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