Instagram API receiving unrelated media for specified hashtag -

i'm making requests instagram api. specifically, endpoint https://api.instagram.com/v1/tags/{tag-name}/media/recent?access_token=access-token (specified here).

using example tag doggo, i'm receiving responses json tags contain doggo; however, receive media empty tags entries:

would happen know why sort of situation might occur? range of untagged media appears slip in varies wildly in relevance specified tag, i'm curious if bug or sort of instagram algorithm infer media item's relevance specified tag.

thanks!