Why are my contacts disappearing on my social media apps?

I tried syncing my contacts with Facebook and Instagram but this happened (see video), why could this have happened? Both apps have permission to access my contacts. Thought here might be a good place to start.

Video: youtu.be/rVot0nDbGUE

essentially what happens in the video is that my contacts’ Instagram accounts appear for a few seconds, then randomly disappear for seemingly no reason