I regularely get a message about buildings being completed on one of my planets. If I check, I see that it is not a planet I own, but a planet from a different player…
Yes, it’s an old bug that’s been plagued for many years. Hopefully Pie can find it and fix it when he can. He is working on improving IC for other stuffs at this moment. 
Thanks!
Be happy! Free intel!
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Having same problem at the mo…Nice to see someone else is getting the benefit of my building 