Studio opens an old project file from a completed project

I've been experiencing a weird bug for  long time, but I thought to write in today to see if there might not be a solution.

I experience that Studio either always/sporadically opens a file in Editor from a previous (now completed) project.

I currently only have one project in progress in Studio. All the previous projects are marked as 'Completed'.

However, if I have project files from the current in-progress project open and then I close Studio, when I open Studio again, it opens a particular file from a previous project.

I'm not sure if it only happens after I've restarted my computer or not, but my question is why it should be happening at all.

Is there perhaps a particular file that Trados is looking at when it comes to which file(s) it should open again when reopening Editor?

If so, is there perhaps a way to manipulate/instruct to always open the file(s) from the most recent project one has been working in prior to closing the application?

Looking forward to anyone's help!