Mine was doing the same thing. App on my watch always shows difference in days from phone app and recently it started showing x days late even after saving. I discovered I could work around it by removing the predicted start date, save, and edit again to put it back. It is great it predicts the correct start date but now I have to remove the predicted day save and re-log to get it to stop the x days late. I find it very surprising the period tracking is so buggy in 2021. Can't log from watch. Have to edit and resave from app for basic functionality that exists in thousands of apps. About ready to give up and go back to other apps.
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