Is it just us or is the Add-on library (Add Functionality --> More Add-ons) within your sites dashboard not displaying all the Add-ons in the marketplace?

Just to name a few, here are some of the ones I've searched for but can't find from within our site:
- Page Redirect by Mnkras
- Page Redirect Block by Site
- Page Selector by Mnkras
- Lerteco Simple Content
- Herent Config Pages
- Ukao Menu
- Security Wall
- Database Manager