thats indeed weired.
maybe not a solution, but did you take a look in the extended console tools?
CTRL+X -> and then point 14 or something else. I don't know how its called in english, maybe something like delete partitions.

There you can see all existing volume groups. Maybe there are still the entries of the created volume groups?

At the beginning, did you delete the volume group with the console, before you deleted the hardware raid volume? (note, if you delete the VG via the console you have to reboot the storage!)

If I am doing something like that, I always delete the VG, before I delete the hardware raid volume. (eg. raid5,6 and so on)

But just check via the extended console tools if there are any entries regarding to old volme groups. Maybe that clear things a little bit up.