I think they mean that those nodes also power another node somewhere on the map...? I’ve only noticed it on one map before and wondered the same thing... I could be wrong though .
It's been answered, they are linked nodes. Press the little triangle logo on the bottom right (second from bottom) and see where all the linked boosts go
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That’s the same thing I was thinking, but it doesn’t match up to the nodes that it shows they’re linked to.