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Hi Wayne,
Thanks for posting back. Happy New Year!
- Yes, the "Image gallery" is the left one.
- I wonder if it's still happening on your side at the moment. If so, please try to use another browser, like Edge, or open the private window of the browser, access the SharePoint page, edit the page, remove the existing "Image gallery" web part, re-add this web part, and check again.
If it is still happening, then there is nothing you need to do. It is likely caused by the server. Please report this to your admin or IT department and ask them to raise a support ticket via Microsoft 365 Admin Center> Support> New service request. That support team there will have the correct channel and resources to help you investigate more and find what exactly reason has caused this problem.
Appreciate your understanding and patience.
Sincerely,
George | Microsoft Community Moderator