Large Bunker Buster Research stops right when I finish

Skilled Warrior
Joined Apr 2011 Posts: 433
My Large Bunker Buster research was 30 mins away from finishing. I left for 3 hours, came back, and I could not construct Large Bunker Busters, and in the lab it said they were not researched. I did not get a refund. Does anyone have an idea of what happened?
Hi I play on the Casual Collective
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