default kernel NOT the latest one installed ?

[lejeczek]

Hi guys.

Some while I go my Fedora lost, dropped it's way to set 
newly installed kernel to be the default one.
Whatever I set manually to be default, remains default 
regardless of new kernels installed later - which was not 
the case, should not be the case, right?
How to "fix" it back to "normal" ?
I fiddle with some GRUB settings & info I found on the net - 
but to no avail - one reservation, a caveat perhaps, I have 
kernel-debug installed & I wonder if that "messes" things up.

many thanks, L.