The digital readout isn't perfect so it's not uncommon to get a slight variation. One bar represents very little, little more than a few tablespoons of oil. The first time you checked it perhaps all the oil wasn't drained back in the sump yet so it read a tad lower. Either way it's nothing to be alarmed about and is actually normal and common. Don't obsess either about keeping at the fill line, just topping it off once it gets below halfway on the readout is fine.
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