There are a few things you can do to help spot when someone shares your post on Instagram. First, make sure to check the timestamp of the post. If it’s after 12am or there’s a timestamp that’s not up to date, it’s likely that the person who shared it didn’t actually read it and just shared it because they saw it on Instagram. If you can, try to screenshot or take a picture of the post before you share it so you can track down who shared it and apologize if they didn’t actually read your post. Finally, be sure to follow people who share your posts so you can see what they’re up to.