Tree map: Colours

Jack Footer
Jack Footer Active Partner
Fourth Anniversary 25 Up Votes First Comment

Whilst using a tree map, I have set an alert from red to green red if its lower than 0 and green for above however the smaller the number (below 0) the lighter shade of red but the closer to 0 the stronger the shade of red... This seems counter intuitive to me, anyone have any ideas around this?

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