FR 965 deos not update recovery time after workout

Good morning, 

Few days ago my FR965 with latest software version 20.26 stopped adding my recovery time after a workout. My daily training is HIIT and I usually see 20h of recovery time after each workout. All data and HR measurements are saved correctly so I can see the resume after the activity.

I'm using HRM pro+ band. Since that, I haven't tried any workout only with my watch without the HRM.

Any ideas of which can be the issue? what else would you like to know for beeing more accurate?

Thanks in advance :)