Top and bottom bars (as separate files) give similar MaxCLL (just bit above 1000nits).
In the same time max Y is 475 vs 705, so very different and not really appropriate for MaxCLL calculation.
Grab is form QTX, so tone mapped to 500 nits Mac screen (irrelevant here).
Top row is just blue channel of the bottom bars.
This makes those metadata values defined in very confusing way, but I assume there is some idea behind them.
I've just learnt they are very different things than what I thought (even if I remembered them been defined in some specific way).
In the same time in Resolve scopes both peak at around 1000nits, so show up correctly. This means when I grade in Resolve (by scopes to 1000nits) MaxCLL should be 1000nits not more.
So I'm confused by numbers from those titles from the other thread. They should not be so "strange" and random. Very possible most of them have simply wrong values as metadata. Some do look fine though.