We do our best to make sure the author of a post is credited, however Instagram limited some of this feature in late 2018 (we aren’t too sure why either).
Repost from a USERNAME: We’ll make sure the credit is attached, and that you’ve reposted using a reputable platform to do it.
Repost from a HASHTAG or VIDEO URL: This was the limitation that Instagram put on us. Since Dec 2018 we’ve not been able to pull the credit from the original author and will have to be manually added.
If what is happening is different to this, be sure to get in touch with a screenshot or recording from your device, and we can get someone onto it straight away!