Originally Posted by CarolPa
I have a lot of books I got free, but usually can't usually get the ones that say Kindle Unlimited.
That is odd.
What device do you have? Some books are only available for certain devices.
It has nothing to do with Kindle Unlimited, but how the author/publisher formatted them. Yes, those are usually in Kindle Unlimited.
PS: Unless it is an illustrated kid book or a graphic intense book, you are not missing much.
For a regular book it usually means they uploaded a pdf that has a fixed font.