I'm running Geany 1.31 on Fedora 27 (GNOME 3.26) and I've installed the Tree Browser plugin. When I try to move into a folder, I double-click on it to open the folder (I set that in the preferences). When I do that, it seems to open every file in my current folder first. When I was using Geany on Fedora 26 it didn't have this behavior.

I'm attaching a screencast (unfortunately in gif form) to show what's going on.