Just to add to the above good comment. By deleting and remapping you are removing the mapping history of the feature. Looking at the history of the buildings now there is only yourself as the mapping user. Mapper Vormond's mapping in 2021 has been removed from the history, I've found it by temporarily reverting your deletion.

So to maintain as much history as possible it's better to amend/correct the original or existing feature.

Regards Bernard.