Thinking about it, I wonder if he’s tried to bolus for 75g carbs but actually bolused 75u?
When I first started with the Omnipod, I did something similar.
I got up one Saturday morning, reading a bit high (9ish), and thought “I’ll bolus for 20g, then have a biscuit when I’m out with the dog.” Half asleep, I bolused 20 units. I’m pleased I checked my PDM, before I’d got too far.
After that, I set a maximum bolus on the PDM. I’m not sure what the default is, but it’s one to watch (especially if you’re a bit half-baked).
Edit.
Default max is 30 units.