Promising, but not always working as it should

Very promising, simple to use. It’s a pity that sometimes it works and sometimes it doesn’t.

Moving a page to another position sometimes does not work at all, whether moving down or up in the tree, whether it’s just one page or a pages with sub-pages.
Sometimes the page seems to be moved to the intended location, but after rebuilding the tree it’s back to its former position.
Sometimes, after trying about 10 times, it suddenly works.

I can’t find any reasonable explanation for these issues.