Just spinning - Self hosted instance of n8nio running behind nginx reverce proxy

Is there a reason why you did not follow our Server Setup guide?
https://docs.n8n.io/getting-started/installation/advanced/server-setup.html#server-setup

It is quite easy to follow and will result for sure in an n8n instance that will work correctly.

Your proxy configuration is for example not set up to work with ServerSent Events. Here is a post that describes what needs to be done:

But again, I advise following our guide!