Hi Mike,
your blood sugar levels for not having eaten at 88 is perfectly normal. 82 is also perfectly normal.
The meter you use will have a variability. Most meters read within 5 - 15% accuracy.
I would blame this result on the meter. But both results are very close, so your meter is also likely also quite accurate.
That happens because your meter (all meters) are only 80% accurate or have a 20% error. so your 88 and 82 reading are the same.
You need to eat more. You should test your glucose two hours after you eat. Your fasting blood sugar should 80 to 110. Your blood sugar dropped 6 points is only because it didn't have time to react. Since you didn't wait two hours.