Print string duplicated in Level BP ( Project attached )

Hi. I have a project and after creating level streaming all my actions from Level BP are triggered twice.
I’ve tried to debug the problem but still can’t figure out what is happening. I’ve deleted everything from the project and now I have only the Level BP with event begin and a print. This will trigger the print twice without any reason. I can’t recreate the level because my entire game is in one level so it will take a lot of time to do it.
I’ve attached the project with all the content deleted where you can see the problem.
Are there any changes I’ve done mistakenly and I don’t see it? Also if you try to duplicate the level from /Levels/Level_1 you can’t. An error will be thrown.
Thank you

269808-project.zip (916 KB)