Let me give you some context.I have a website and website/blog with each their own wordpress instal

I created the the blog in the first place, and then the "main" wordpress.

The weird thing is that now, when I want to go to website, it automatically redirects me to website/blog.

And sometimes it is the opposite, the website works, but the /blog is not existing anymore... (404 or just blank page) And these two cases are shifting from one to another (not sure how)

Any idea why this happens ?

Thanks for your help !