Instagram API getting unrelated media for the specified hashtag

I am currently making requests to the Instagram API. Specifically the end point https://api.instagram.com/v1/tags/{tag-name}/media/recent?access_token=ACCESS-TOKEN

(specified here ).

Using an example tag doggo

, I get mostly responses whose JSON tags

contains doggo

; however I also get media with empty tags

elements:

Does anyone know why such a situation might arise? The range of untagged media that appears to slide varies greatly depending on the tag specified, so I'm curious if this is a bug or some Instagram algorithm to infer the relevance of a media item to a specified tag.

Thank!