My son and I were playing a medium size map against two AIs.

About 7 hours into the game, we realized that we both were holding the same two planets.  Really.  Two different games were showing two different results.  His Novaliths were firing on my planets on my computer, while on his computer they were fully powered and not firing at all.

We check to make sure we were connected, it showed my ping and his.

We reloaded, and it still picked up showing inaccurate information.

I looked and didn't see this bug listed.

Another bug is that on one planetary assault, all of my units except my strikecraft just sat in the gravity well, unless I told them to attack a specific unit.  After killing that unit, they would return to outside of the gravity well unless I told them go attack another target.  Strikecraft were fighting consistently though.