1. Title/Summary: Story Boosts labeled the same can't stack or reset duration, ends them instead. 
  2. Description:  I've noticed story events that boost science/gold/production/food will cancel each other if they're labeled the same.  Labeled differently like "Learning" and lets say "Science Investing" can both be active on a city. Two "Learning" boosts can't overlap and instead, remove the boost. 
  3. Steps to Reproduce: An example would be if a city currently has the "Learning" boost and a story event appeared offering another "Learning" boost. By accepting another "Learning" boost on city that already has one, the boosts are canceled and lost with a notification stating the boost is gone.
  4. Reproducibility: 5/5
  5. Expected Behavior: Either no change to the boosted effect or a reset of the duration.