Hello Richard,
thanks for choosing Ikebana! I can’t seem to be able to reproduce the issue on the latest version of WP with a child theme setup like yours. From the console I can see that the issue is JS-related, could you please try disabling any active plugins one by one to see if the issue disappears at some point? If this doesn’t help, I’ll need to ask you to provide admin access to the website (login and password can be sent to support[at]satoristudio.net, will not be shared with third parties).
Cheers,
Andrii / Satori Studio