Testing the Fitbit Charge 5: not the best of starts

I have been testing the Fitbit Charge 5 and after 1 day I am already struggling. My experience with Fitbit has note historically been one where I have a lot of faith in the hardware, but this is a strange start. See above and you will see the battery at 68% in the Fitbit app and this was after only 12 hours. That is disappointing for a device with a 7 day battery life claim.

Not to worry though because the Fitbit Charge itself is quoting 97% battery remaining. What is going on there? 12 hours later the app is still stating 68% with the Fitbit now at 93%- I'm confused .