Yes, this is microG working as intended, and Aurora Store couldn’t uninstall or update those Google Play Services successfully even if you tried, because they aren’t the real Google Play Services. So, at least nothing can break there at any point.
But it sure is a confusing look, if you didn’t know beforehand. Many Aurora Store users have encountered this.
If it bothers you seeing this, you can let Aurora Store just worry about the Apps it installed itself, and this will be gone …