Your second image only has three digits showing when I view it (and it's not 'clickable' to expand the view).
This is, by far, the best site for uploading images:
http://upl.co/
(Copy the 'Direct link' and paste it here).
As you've explained, your meter does appear to have 6 digits though. A 5 digit meter should have an extra 6th digit in red (or with a red surround), as illustrated here
https://www.edfenergy.com/sites/default/files/meter-electricity-digital.png
The 'red' digit is counting tenths of a unit and can be ignored. However the '3' in your first image is definitely in the 'units' column (and NOT in a non-existent tenths column) and therefore forms the final digit of your meter reading.