Total daily, weekly kilometers not correctly displayed

Are you referring to the "Last 7 Days" section on the "My Day" page? "Last week" doesn't necessarily mean the last 7 days, which is a rolling total.

I checked mine and it seems to be adding up correctly. Can you send screenshots of what you're seeing? 

Go to Garmin Connect Web look at your walking activities on this link - https://connect.garmin.com/modern/activities?activityType=walking

If things don't add up please post a screen shot of that page.

It is missing most of my walking sessions.

My 7 day trend.

No it is not. Please see the second screenshot I sent. I have walked 61.6 kms since October 1.

Your screenshot is showing steps, not activities or walks. The activities are the 2 walks you took for the month so far and the 2 walks for the last 7 days.

Activities are those walks where you recorded them as a walk. Where you pressed start on your watch, then stop when you finished (or where they were recorded automatically by the watch using Move IQ). If you're using Move IQ, it's possible your watch is not detecting those as walks and that might be the problem.

What is Garmin Move IQ? | Garmin Support

Steps are recorded independently from activities by the built-in accelerometer on the watch.

Again, checking my own last 7 days, I have 57,543 steps and 34.1 miles. But I've only actually ran 30.7 miles worth of activities in the last 7 days. The app is converting those steps to the "Total Distance" value on your screenshot.