I run Zwift 1.116.2 on MacOS 26.5.1 and today while riding on Col du Telegraphe as part of the L’Etape Challenge I have often the feeling that the gradient of the climb doesn’t match current resistance set on my trainer - especially red portions were off, when gradient of >10% felt easier than 8-9%. I the recall there was a similar issue in another climb portal somewhere in the 2024, which I also noticed back then.
I’ve seen plenty of instances where the color doesn’t match the gradient.
Check the sections carefully, each segment is an average. A red section can average 12% and still have a bit of 5% and 20% in a very short distance. I notice this also on Ventoux. The instantaneous number on the upper right in the mini map shows what you are on at that moment. The color segment does show the average for that section on the left side, whether long or short.
Color is only a part of it. I meant specifically gradient in the right corner. The resisted was off in regard to what number was displayed - 12% had less resistance on the trainer than 9% and so on. Obviously something is broken on this climb.