AI makes dozens of useless starbases?

On a medium map, all genius AI. Near the late part of the game I noticed that the AI was building dozens of starbases scattered throughout most of their home sectors and adjacent sectors (with no planets OR resources).

Is there a reason the AI does this? It did make culture bombing and terror star building a little annoying since you can't build starbases within 3 parsecs of each other (except resources). But the cost alone of all those starbases seems excessive!
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