Don't know if it's a clue but in the OP, the layer count is out as well. Almost as if the print was terminated early.
I just had grabbed the text from whatever was printing. The print completed successfully π
Er, in that case I'm not sure that I understand the problem. In your OP you stated that the web interface reported that a certain amount of filament used, a certain amount of filament needed in total and certain amount of filament required to complete the print. But this was before the print was completed so I don't understand how you conclude that the filament usage was out by 30%. What did it report at the end of the print?