Legion Mission Success Decreasing

Since Legion Missions were back up on the mobile app, I’ve installed and been using it to send out on at least four toons. Before I accept the mission, I’m assured that the success rate is 200% to earn the bonus. But when the mission is complete and I’m collecting the reward, too often will the success rate drop between 145%-150%. On the mobile app I have not been able to check what the success rate is while the mission is in progress, and checking the toon’s mission table in game seems to defeat the purpose. So is this a display or functionality issue?

I have seen this also. Additionally, I have seen the bonus loot just vanish even on missions above 100% chance.