There actually is a curve between those two straight lines on the main stretch, but I have ended up adding another straight line coming up from the lower right to make a shorter curve that aligns better with both straight portions.
i finally found an odd looking spot by that corner in the lower left. When I erased and put in a new arc there, the figure of the circuit filled in with a blue color, so it seems I finally found the culprit. Thanks goodness for that lucky break. And thanks you your input, all of you.
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