All the edit filters are set to clips. There is no logical reason why lassoing everything would result in everything being selected except one random clip in the middle of the project.
Things just get weirder. Here is a screenshot of the whole project. I've just lassoed everything. Note the relative positions of the clips within the red rectangle.
I then dragged everything across to bar 1. Below is a screenshot of the result. Observe how after the drag, only some of the clips are selected (it seems to be random). Also note the same clips within the red rectangle - they are now positioned differently relative to each other than before the drag. It's like I've drag copied instead of dragged, and left some clips remaining. But all I did was drag, I didn't CTRL-drag anything.
I'm just at a loss to work out what's going on here. These things are typical of the oddities that seem to build up in a project the longer I work on it. If this is expected behavior and there's some kind of functionality that I'm not getting, I'd like it explained. Otherwise I'm curious to know why such a simple task as selecting and dragging clips still doesn't work properly.