Zwift dont change intensity

I have been using Zwift a few days and I really like it. In fact I was thinking to change from bkool to Zwift. But today in my 4 or 5 training it doesnt change the intensity.

Im using a classic Bkool with the Ant+ FE-C. Everything looks to synchronize well without problem. And i had not any problem until now.

Any ideas?. Thanks