After replaing HDD's, the Pools show different disks etcc and some strange behaviour

Which HBA controller and is it in IT mode?

Also, please read this posting. It is actually not that long since you would use a specific section for your problem. But it provides commands to run based on the problem at hand, and then you can post those to this thread so we can help you out.

And welcome to the forums, wish it were under better circumstances.