You didn't add too much, technically. The crankcase ventilation system just lacks any sort of valve or other form of separator to help block the oil that finds its way to the vent tube. Then, the vent tube itself is mostly horizontal, so oil doesn't effectively drain back.
Most people try to solve this by adding just 1 quart of oil, which usually puts the oil around the half to 2/3 way up mark. It is effective and definitely helps, but it is still just a band aid work around.
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