Resolution of Zwift from iPad's screen displayed on Technogym Ride incorrectly

I’ve been trying to cast Zwift from my iPad to Technogym Ride’s screen via an HDMI cable. I’ve had no problem casting my iPad screen on my TV or projector at home though. Does anyone experience the same issue?

See the photo below. There is a weird green box that squeezed the iPad’s screen and makes it unproportionate.