This is expected behavior. The Min Value and Max Value don’t give the end user the granularity to declare exactly what the min and max are; rather, they allow the user to set what will at least be included as the max. 

Well, that’s a bit silly.

Why does it work as expected with just one axis, then?

If I have one axis and set the max value to something lower then the highest data point, it will still cut off that data point. It’s not acting like a ‘minimum-max’ in that case, but as an actual max.

I’m unable to have it work like that for only one axis. Can you get an arbitrary Min like -3 and Max of 73 to work with granularity?