Same Delivery is showing in open order report but not in SO's Doc Flow.

Hello,

I'm seeing this issue regarding 2 different orders; in the Open sales order report they have a common delivery (NOTHING SEEMS WRONG HERE)

However checking individually on both orders' doc flow they both have different deliveries:

The common delivery's number displayed in the open sales order report is: 827445538; However checking on this delivery it only includes materials from one of the orders:

Any ideas on what's goin' on here?