Ran into the same problem a while back. The Trader Rating is a function of the Market Observer OXZ. The two OXZ's are incompatible in that the Trader Rating function has no way of reading cargo that is placed into HyperCargo and thus returns with the lost cargo thing lowering your Trader Rating. There is a relatively easy work around but it involves two things: Being able to do a simple edit on a .plist and not being able to ever see your Trader Rating again. If this is okay by you read on.
Open the Market Observer OXZ. Open the config folder. Open the world-scripts.plist in the config folder with your favorite script editor (not Windows Notepad). The second line of text in that world-scripts.plist file should look like this:
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"mo_traders_rating.js",
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//"mo_traders_rating.js",
This game is sometimes an Ooniverse of choices. To me HyperCargo is a much more vital system then the Trader Rating so the sacrifice was made.