Unrecognized deeplink format on app launch

Question

We have an app in prod and I notice there is many user getting this deeplink on app launch that doesn't get recognized. I was wondering what it was and if that's normal.

Here is the deeplink they keep getting:

{"af_sub4":null,"click_http_referrer":null,"af_sub1":null,"click_event":{"request_ip_version":"IP_V6","match_message":"No pre-install link matched for this device."},"af_sub3":null,"deep_link_value":null,"campaign":null,"match_type":null,"af_sub5":null,"media_source":null,"campaign_id":null,"af_sub2":null}