Mission 4 Glitch cannot destroy all 12 depots

Games Halo Wars Series
1
  1. Issue: On mission 4 I destroy all 12 supply depos, but the game only registers me as having destroyed 11 of them. This means I cannot get all the energy I need and cannot get a gold medal playing it.
  2. Platform: Xbox One
  3. My Gamertag: The CMART
  4. Region: Western Europe/Germany. I play the game in English