Hi Robin,
I think the permissions issue you had is now fixed. You should now be able to flag any of your observations which have been incorrectly plate solved.
I’ve flagged the two images you linked above myself, and also taken the liberty of updating the object tagging on the Nov 2020 image, so that it will come up in any searches for images of those two novae. The two novae weren’t in the object database at the time you uploaded the image, but I added them a few weeks ago.
Thanks again for reporting this,
Dominic