Confusion re open versus closed balances?

I go to the drugstore and buy $15 worth of prescription drugs.

I create a Bill of $15. I have an Open Balance for the drugstore for that purchase.

I create a Payment of $15. I now have a Closed Balance for the drugstore for that purchase.

However...
I go to the doc. He has a copay of $15.

Perhaps the problem is because I did this backwards.

First I created the EOB...
$100 Charge
$75 Allowed
$60 Paid

This created an Open Balance of $15 (in red).

Then I created the Bill for $15.

Then I created a Payment for $15.

But now I still have an Open Balance of $-85 (in black).

I'm thinking that somehow after all this I should have ended up with a Closed Balance (since this doc visit is now fully taken care of). But I'm not sure how to get there... whether I entered a piece of info I shouldn't have or put something out of place.
Inappropriate?
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