@zemledelie that’s actually something kind of normal to happen, i explain the reason of it.
When you use the plugin, it generates a single avatar for each user. This avatar is generated according to the settings you define in settings page and given the user name initials. The generation process happens automatically when a new avatar is requested.
If any of this settings change the user avatar will be generated again, however, the old version of the avatar will no be deleted. That would lead to have multiple avatars for the same user in uploads folder.
That’s the reason why you might have more avatar images than users in you site.
User avatars have small size as they are very simple SVGs, so it shouldn’t be a problem to have all of them hosted.
If you still have a problem with that, just delete all avatar SVGs manually, the plugin will generate them again automatically.