Fish from the Seawolves has mentioned this to me as well, I think its a bug in the game.
To work around it, you might want to rely exclusively on the dynamic groups and cut out dynamic locations altogether.
You could creat a one master dynamic group, probability 100%, with four or so groups under it at 25% each. Each of these subgroups would have several subs assigned to it (you'll need to add all of these objects to the map for all dynamic locations), but allow only one of them to be generated.
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