Isn’t this just a weird interface choice (from Bulb) in the mobile app?
If I look at the “Meter readings” list I only see smart readings every 30 days (or, one on the date of the recent tariff change). It looks like it’s listing the values that they record for billing, rather than the values received from the meter. That kind of makes sense, from a legacy point of view: its the analogue of taking a reading for the bill.
If I look in the “Week” usage charts I can see they’re getting data every day but it doesn’t show the exact daily amount. Just the weekly sum.
With a web browser, my Bulb account dashboard does show more detail on the graph, but again not in the list. That’s probably where you want to be looking.