Items not showing up in sitemap

I have two frame declared in my sitemap file. Both frames contain items, but only the items in the first frame appear in BasicUI. All Items from both frames are declared in my items file. What might I be missing?

Most possibly… a syntax error in your *.sitemap file.
You can use ESHD to debug it yourself. You can also post it here to be checked.
Use triple ticks to post the content of your sitemap file:

content goes here

Yep, syntax error. I was declaring My dimmers as Dimmer in the sitemap instead of as Switch.