Newbie – problems with Publii on Linux

Hi, I’m new to Publii, and trying to get a grip on it, but I’m seeing a lot of random instability and weird behaviours.

1. Tags editor randomly refuses to add tags, saying “already in use” but then accepts them later after fiddling round. For example, trying to add the tag “Woodwork” was refused, but changing the name to just “W”, and then progressively adding the remaining letters eventually worked. As an aside, the user interface is also confusing, as saving a tag immediately reopens it for editing, but the change in context is not particularly clear, so I’ve inadvertently lost some tags I thought I’d entered, because it wasn’t clear I was editing the one I’d just created. Now I know, I can work round this, but it was a bit annoying.
2. Lockups when saving posts or other “write” operations, and apparent loss of content in posts, but content reappears when I kill and restart the app.
3. Twice I’ve had SQLite db constraint errors when doing “normal” operations.

Do I just have a bad build, or am I doing something wrong?