It's a Skill Point boost.

If you're in a team that has a 700-day Veteran or Lifetime Subscriber in it, they have a special ability that gives 5% more Skill Points and Bridge Officer skill points to all members in their team when Skill Points are earned.

This is why if you're in a group that doesn't have a Lifetime Subscriber/minimum 700-day Veteran, you won't see this pop up.