Trainer resistance to Rouvy

In Rouvy I have Power, speed, cadence and trainer control coming from Vortex. My watch is connected to power from the Vortex only'speed and cadence from separate Garmin sensors, trainer has been connected and not connected but made no difference,

When I load a course from Rouvy and start it there is only intermittent resistance changes from the Vortex. Sometimes not at ll, sometimes it comes and goes. Meanwhile my wife on her Vortex alongside is feeling all the hills,

Any advice?