Vector Scope display is upside down

Vector Scope display is upside down

When the display of Vector Scope with Clarity m, seems to be the direction of the XY axis is reversed.
For some other Vector Scope, the upward direction is positive polarity.
Why is this happening?

https://twitter.com/fixerhpa/status/1069188058283565057
https://twitter.com/fixerhpa/status/1069500212471713792

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Source: http://forum.tcelectronic.com