Can't delete NS records on pointer

[turbo2ltr]

I somehow made a mess of the DNS record of a pointer.

Somehow some parent entries got into the pointer DNS record. (I think from the "copy entry to pointer" checkbox when creating parent records)

So now I get the following when trying to delete the first NS record (and similar for the second record)

And I get this when deleting the third (no changes are actually made)

Any ideas on how to fix this? Thanks

 

[turbo2ltr]

Also if I try to edit the third one, and change it back to the pointer, it adds a fourth entry which is actually correct.
But if I try to delete the third entry, the fourth new entry is deleted and the third stays!

 

[turbo2ltr]

I manually edited the named config for the domain and got it sorted. Seems like a bug.