Steps to reproduce
When using the search function in the web browser, results will show results from the current folder(if any) and then show results from every folder on the server.
For example, a search within the hierarchy of “All → Subfolder 1 → Subfolder 1a”, results in search results from “All → Subfolder 2”.
According to the ownCloud documentation, “When changing into a directory, search starts in this folder, displays the results, and continues to search in subsequent folders.“
I am a general user of our ownCloud server and do not have access to the majority of the other requested information. This issue has been reproduced with several users and with multiple browsers.