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Not come across this before so I thought I’d share it.
When a Report runs and it’s set to ForEachRowInTable, any App Formulas or Initial Values with ResetOnEdit set are recalculated. Yet when a Report runs there is not logged in user. So any formulas using UserEmail() can be unpredictable.
In my case this:
ANY(Select(Staff[Hourly Rate 1],[Login Email]=UserEmail()))
simply chose the first Staff[Hourly Rate 1] it found and paid everyone the same hourly rate 
Luckly I always have a column to record the email of the person who created the record. So I’ve simply replaced UserEmail() with that column.
