This happened last night after the servers had been inactive (not letting us join) for around 15 minutes. It lead us into this game where it was 9v2 for a while until people started to join the server and be placed on the Insurgent team. I was in a party of 3, and I asked my teammate if they were in a party and they said no.
Bad team balance in firefight 9v2 (screenshots Included)
A different person with this issue
Source: https://old.reddit.com/r/insurgency/comments/9eb98c/need_team_balancing_asap/