Among many other stupidities in OneDrive here comes this:
File is downloaded, but... not.
The second counter (bottom one, with smaller font) went from 0 to 1 019,5 MB in the exactly the same period as first counter (top one, with bigger font) doing the same. Then -- magic! -- The smaller counter got frozen 1 019,5 MB while bigger counter started counting from 0 to 1 019,5 MB again.
To make yourself (itself?) sure OneDrive decided to download everything twice! :>