It’s not a bug – it’s an undocumented feature.
Hi!
Yesterday, 14/05/19 at 20:30 I had one event RIDE LIKE KING 11 Training Ride, Innsbruck:
events.php?zid=186204
The result for women was missed. I wish it could be fixed.
https://www.strava.com/activities/2367593112
Thanks!
ZwiftPower was never setup to handle duplicated categories in an event. In this case there are Two "E" categories, so only one gets picked up at random.

A code update was planned but never implemented as it was a rare occurrence.
great.
thanks for your answer.