For me it's easy to reproduce with installing the SoundCloud scope as
there are lots of reviews to scroll down through.

1) Tap the "Install" widget at the top of the "SoundCloud scope" store page.
2) As soon as the progress bar starts to animate, scroll to the bottom of the 
preview page.
3) Wait for the installation to complete (you'll kinda have to guess when it's 
done according to your internet connection as there will be no indication).
4) Scroll back up to the top of the preview page.

You'll notice that the top widget is now an empty 0% progress bar.
You'll also notice that there is no "Add a review" edit box visible (this 
should appear above the "Reviews" section upon successful installation).

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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1547255

Title:
  app install progress bar resets to 0 when scrolled out of view

Status in unity8 package in Ubuntu:
  Triaged

Bug description:
  Install a larger app (e.g. dockviewer). While its downloading, scroll
  down to the reviews and wait a considerable amount of time (i.e. wait
  for it to be installed) and then back up. The progress bar will show
  0% now.

  Comment from Albert: The problem is that the scope is relying on the
  UI to tell the scope when the installation has finished (See
  onFinished in PreviewProgress.qml) but this won't if you have scrolled
  the Progress widget out of view since it's getting deleted.

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