Apper inconsistent with yum and dnf

[Peter G.]

I think I found a different explanation.

I must have missed it on the desktop computer, but this 
morning, when updating the laptop, I noticed that yum 
counselled me to run:

yum makecache fast

After I ran it, yum installed the packages that apper was 
constantly saying needed updating, even though yum never 
found them. Now, it did and all of the programs are in 
sync.