The camera profiling in PL7 makes my photos brighter. A perfect photo of a Calibrite (X-Rite) Classic Profiling card, makes the photos go 1 Ev brighter. So why would the profiling adjust the brightness? Colors I understand, but this seems to be a bug.
Using MAC Monterey PhotoLab 7.
I don’t know the answer, but I do know that changing the white balance can substantially change which areas of a photo are clipped. I usually set whit balance near the start, but if I forget and change later, I often have to re-balance my light levels.
Might be a mac bug? Its fine for me on Windows.
As mentioned by @zkarj, tonal impression can change and this depends on the image as well. I don’t remember drastic changes asking for 1EV corrections though. Maybe you could share a copy of your raw file @Sir-Peter? We could then check if we get the same change or deal with an individual issue.
The usual answer is that you have more reflected light on your target than you think.