Not relevant Intensity minutes on Edge 840

Hello,

I am using garmin edge 840 (firmware 21.18) with hrm-pro for my cycling activities. I got FR 255 set as primary training device and wearable, set intensity minutes based on HR zones - Moderate Z2/Vigorous Z3.

Yesterday I did cycling activity with around  7min Z2, 80min Z3, 11min Z4, However in garmin connect app I got Moderate 4min, Vigorous 13min. Depicted below.

Is this any kind of bug? How can I fix this issue?