I see - I think - on every first ride of the week a message “weekly goal met, 5 hours!” But it was only a ride of half an hour and the first of the week. Maybe I am seeing it wrong but it seems weird to me.
I just completed my weekly goal and when I went into my goals after my ride it said I had 31.4 km and 7 days to complete my 100km.
I have been getting this exact same problem for the past few months. As soon as I start my first ride of the week I get the “Weekly goal met” banner.