Pixel event set up not loading. Anyone experiencing this?

Tried clearing browser history cache, incognito , tested on multiple browser. It's stuck here. Pixel is installed properly, I checked using extension.

yeah, happened a lot, that's why I never use the Event Setup Tool... it's toy!

I know you tried incognito mode, but this make it even even worse. Try to deactivate all of your Browser Extension, clear again cache and cookies.
But my best advice would be, stop using those extra tools and install your events manually, it's not that hard.

https://developers.facebook.com/docs/facebook-pixel/implementation/