Non recorded sessions

Very strange occurance yesterday. did the #1 ZA threshold workout, was on 480000 drops, finsihed with around 500000, did the workout dropped 4 stars overall as my trainer dropped a couple of times … but none of it recorded. Im not too bothered, ill just do it again. Just getting this out there to people to turn on ur indoor setting on a seperate watch if ur bothered about recording distance.