Dev instance does not show in alias

Sometimes, but not always, when I do a new deployment (even after multiple times loading it) and even after waiting for 2 hours, what shows in my .dev deployment does not show up in my alias (my actual website).

I don’t understand why and the documentation has not helped.

On the “Workers and Pages” screen, when I click on “dev” i do see my full deployment, but when I click on the alias it does not show the same. It seems that one of my (fairly large) .js javascript files is not getting deployed to my alias


.

Ideas why this might happen?