Changing nickname leads me to a variety of biscuits?

[Penneyanne]

Hi,sorry to be a pain but every time I try and change my nickname I get the 'biscuit' page.
I have today alone had bourbons,custard creams and most recently those squashed fly ones.
I can change nickname alright by going into 'My Mumsnet' and selecting 'My account'.
I am just wondering if it is no longer possible to change name by choosing 'how to change my nickname'.
Thanks.

I'm getting this too, but I'm getting a jammy dodger style biscuity thing