The Spend vs budget slide used to count only the event's purchase orders. The budget on the event's page also counts bills that weren't raised from an order, hours, the event's own items and its expenses. So an event that spent outside its orders showed less spent in the deck than on its page.
The slide now shows the same figures as the page, split into what is committed (orders not yet billed, draft bills) and what is spent. Each row adds up to its total. A draft order now shows as committed, as it does on the page.
As on the event's page, only people who can see the event's budget get these figures. For anyone else the report leaves the slide out.
Make the report again to get the new slide. Reports made before keep their old figures.