It takes about 15 minutes for food to raise your blood sugar level. The only thing that I can think of for the difference, would be an invalid test. Did you was your hands prior to testing? One of the biggest problems, that I see, with your situation is eating so late. You need to eat in ~4 hour intervals. If you must eat late, make sure that you have a snack to hold you over.
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Regards;
Danny 
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