File keeps to reopen itself in the editor

On Intellij Idea Ultimate / Pycharm pro (happen on both), working on a multi app django project:

Seems like it happen only when I have the "split editor tab" on.

After I opened a models.py file (django python file) and closed it, it randomly reopens in the editor tab where I closed it, bringing back the focus to that tab (remember I'm on split editor tab) and totally disrupting me from my work.

Strangely, this seems to happen only with models.py files, absolutely randomly (between 0 seconds or more, most of the time between 0 and 10. Sometime it doesn't happen at all).

As the behavior is shared between Pycharm and intellij Idea, I tried removing .idea and my_project.iml files, with no luck, still happens.

Any thoughts on this are greatly appreciated