When a section is copied using a long list of sections in the Navigation toolbar (and the toolbar is unpinned), the testplan will jump to the position to which it is copied (unless the user releases the mouse button in a specific place), meaning that users must then scroll back up to the navigation toolbar to copy another section.
Thanks for reporting this issue. We will look into it for a future version of TestRail. As mentioned in the other posting, we plan to redesign some aspects of the test suite page and usability improvements for the section tree are also part of this effort. I’ve added this issue to our todo list for now and we will look into it.