When you updated the URL with the DB manager, it’s possible that it didn’t get all of the references to https.
One thing to note about urls within a WP database is that there isn’t anything that’s relative – ie, you can’t define a base url and have all the various pages be relative to it.
When I’m updating urls in the DB, I usually will use wpcli in the site shell. Click “Open site shell” and in the resulting terminal, you can search for instances of the old url with https and replace it with the regular http version. Note that I don’t have a slash at the end as that will usually pick up more hits within the db:
Hey @SRD! If you look at Ben’s screenshot above, underneath his site name Alex Test, you’ll see the options for Site Folder and Site Shell. These should be the same on your application as well!