Migrated a forum from BBPress to Xenforo and now, sometimes CSS or JS doesn't work

We had an old BBPress forum migrated to a Xenforo and I migrated the data using Python (also most of the caches). Also rebuilt the caches from the admin panel. But now, I am having issues such as a portion of JS not working on the admin panel (instead of extending the menus, it directly opens the menu category page) and on the front, CSS variables don't work. It looks completely white.

What I mean by menu category:

White page:


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