This is too weird. I have been having a similar situation this week. Had a lovely, very light 4 pm dinner on Wednesday. By 6:30, I was 180, but had BOB, so waited. By 8:00, still ip near 200. Corrected at that point. I wear a CGM and overnight I was pretty steady at about 180.
Since insulin was not budging the numbers, I inserted new insulin and set. Did well until 2:00 (ate two very small buns with egg on them--14 carbs for 2) and my blood glucose began to rage. I corrected 7 times in the last 24 hours, switched my insulin twice, going to a new bottle and delivery kit right before the final correction at bedtime and still woke up at 162. Corrected again to that reading.
Oh, and even though I am careful with corrections, calculating with BOB, I usually crash, as you did, at some point. It is almost like my body is laughing at me: "he, he. We put her through the high struggle all day yesterday, so now let's crash her glucose readings. he, he."
I am still going to eat the 35 carb almond croissant I set out to rise last night.... I am sure I will pay again, but at least I will know why!