Anti sandbagging races ZHQ

I am a female rider and I am cat C for women’s events and cat D for mixed according to Zwiftpower. I joined a ZHQ anti sandbagging event in D yesterday and got flagged within 5 minutes of starting. I had entered in the correct category for the mixed event but had the green arrow and the brakes put on. The system doesn’t work for light riders whose average watts are within tolerance but w/kg exceed cat limits.