My guess is that ASIStudio viewer ignores the white balance (WB) values in ASI camera drivers. Ekos should too but it doesn't. This is actually an issue which must be fixed.
ASI default WB_R=52 WB_B=95 produces twice as much blue in Ekos (and not only in Ekos).
When set to WB_R=50 WB_B=50, the histogram looks as it should (in Ekos).
ZWO software also ignores the offset value (they use some fixed number depending on the camera).
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