I think a similar problem occurred, unintentional large bolus, by a member that posted here several years ago. She accidentally did a large bolus during the night. On the bolus screen, you used to be able to quickly set the highest amount with one arrow press. Her max was defaulted high, and being half asleep didn’t realise how much she bolused.
Current MM pumps have to scroll starting from 0. I have my max set to 4 just for protection against accidental high bolus.
Here is the prior post.