The picture gallery is located in the middle of the site page. Click on picture to view it in the pop-up gallery window. When the gallery window is closed, view of the site is turned back to the top of the page instead of the staying on the same position.
The issue is caused by software issue #PPB-4426.
This issue has been considered as software issue #PPB-4426 and will be fixed in future product updates. Please subscribe to our knowledge base to track the issue status. Each product update comes with corresponding KB article: http://kb.plesk.com/rss/index.html.