The 5 button that control zoom, header/footer display and layout sometimes appear on the left upper corner of the scanned image, and sometimes they appear in the toolbar under "Proofread tools".
This seems to depend on which module is faster to load: if the toolbar loads first, the PRP extension finds it and puts the buttons there, if the PRP loads first it doesn't find the toolbar and puts the button on the image.
It seems to happen on all wikisource subdomains (I've seen it on it, en, fr).
Version: unspecified
Severity: major