Thanks JorgeB,
That solution did indeed erase the duplicates, and seemingly ammended the flash config file.
I am still a bit stuck on, the issue shown below..
The "cache_protected" (unassigned) duplicated as cache-protected 2, with 2 slots.
Do I just drop to 1 slot and it will keep the assigned device?
Or should I be assigning, effetively swapping, the "sde" drive to the "cache_protected" first?
Sorry for the numpty question I have not come across this before.