What operating system and version of Zotero are you using? If you are using any plugin, does this still happen with all plugins disabled?
Are the two images produced with the Select Area tool in a PDF Viewer tab, with the problem appearing in the sidebar on the left showing the annotations on this PDF? The option to "Add Comment" should appear after selecting the annotation. Do you also see the problem with other types of annotations? Could you make a screenshot demonstrating the issue? You can upload it to some sharing platform (e.g. Dropbox, OneDrive, Google Drive, ...) and provide the public link here.
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If you are using any plugin, does this still happen with all plugins disabled?
Are the two images produced with the Select Area tool in a PDF Viewer tab, with the problem appearing in the sidebar on the left showing the annotations on this PDF?
The option to "Add Comment" should appear after selecting the annotation.
Do you also see the problem with other types of annotations?
Could you make a screenshot demonstrating the issue? You can upload it to some sharing platform (e.g. Dropbox, OneDrive, Google Drive, ...) and provide the public link here.