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Ketone levels vary throughout the day for many reasons, or no reason at all. You’ll never be able to reliably predict ketone levels, so the first lesson here is, do not sweat short term swings in ketone levels. As you can tell, it’ll drive you batty.
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Without knowing what you had for dinner, you may have had a glucose/insulin response that drove the ketone levels down temporarily. No big deal.
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For me, ketone levels are highest in the afternoon before eating. So, your 1.3 in the afternoon makes sense. My levels are lowest in the morning.
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Exercise will affect ketone levels for me. Drop them right after exercise, but raise them as the day goes on, especially if I’m fasting.
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Once you become fat adapted over a period of 6-8 weeks, your ketone levels will actually go down because your body gets more efficient at using/producing them, that there’s not an overly large extra amount in the blood. But, only 7 days in, you’re not there yet, so this is more of a long-term thing to keep an eye on and not get frustrated.
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Ketones are the RESULTS of fat loss, not its CAUSE. Ketones do not CAUSE weight loss.
So, all in all, KCKO, chase results, not ketones, and use measuring as a tool of interest, not something that fouls your mood up or ruins your day. (Speaking from experience on that one!) 
