Kmail duplicate and ghost emails

Hi

How does kmail determine that an email needs to be downloaded from your ISP? 
It doesn't mark the emails on the ISP as read after downloading them.

I've got a situation where most days, it downloads emails as duplicates from 
up to 2/3 weeks ago and they show as unread.  I can then mark them all as read 
and remove duplicates via the menu options, I also end up with a lot of ghost 
emails in the threads which are generally the duplicated ones which you cannot 
remove.

I have tried creating a new user but the same things happen.

The downloading of duplicate emails also occasionally happens on my personal 
account on a different login but i can remove them and i don't end up with 
ghost emails (well, not as yet).

For the last 2/3 weeks or so I have been getting "PIM Migration complete" 
messages almost on every start up.

Any ideas how i can repair things short of reinstalling the whole OS.

regards

Ian
-- 
openSUSE Tumbleweed 20240923
kwin 6.1.5
kmail2 6.2.1 (24.08.1) - akonadiserver 6.2.1 (24.08.1) - Kernel:  6.10.11-1-
default  - kernel-firmware-radeon  20240913