I’ve been doing one of the Training Plans. On the report after each workout, I’m getting an HR distribution that goes from 60 to 1188 bpm. The figures in ride are spot on.
It sounds like you’re getting a display glitch. That, or you need to see a doctor immediately!
You may also want to try taking the battery out of your heart monitor for 30-ish seconds to reset it.
This display issue should automatically be fixed from our side with updates, so keep your Zwift app up to date.
If you have any more questions, let me know!