Yes, something did cause the spike. My guess it was the mango in the evening . Did you go for a walk afterwards? Sometimes that helps to offset fruit consumption. Perhaps the mango, (delicious, I know,)earlier in the day would have been offset by your usual activity during the afternoon. These spikes are so puzzling, and often the same food doesn't seem to have the same consequences.
I should have been clearer - sorry. It's obvious the mango caused a spike, probably twice. But I was just interested to know if recovery to under 2 points differnce in three hours (2 hours is of course preferable) is reasonable all things considered and how the following numbers pan out. I don't really have any kind of reference point.