Well, maybe you have the water set too high in your skimmer. Open it up a bit. Mine usually produces more bubbles and foam after a water change, and I have to be sure my water level is not too high or it will overflow.
I think outside air pressure affects water levels in the skimmer, too. Was it a high pressure day?
Or whatever you were dosing might have affected it....
Some skimmer mysteries just remain so....
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