Starlink satellites trail through the field of view of the Dark Energy Camera. Credit: DELVE Survey/CTIO/AURA/NSF
From Stalking Starlink's DartSat, Field of view diameter is about 2.2 degrees
(even better image: https://i.stack.imgur.com/EBpeP.jpg from NYTimes)
An image of the NGC 5353/4 galaxy group made with a telescope at Lowell Observatory in Arizona, USA on the night of Saturday 25 May 2019. The diagonal lines running across the image are trails of reflected light left by more than 25 of the 60 recently launched Starlink satellites as they passed through the telescope’s field of view.
Although this image serves as an illustration of the impact of reflections from satellite constellations, please note that the density of these satellites is significantly higher in the days after launch (as seen here) and also that the satellites will diminish in brightness as they reach their final orbital altitude.
Credit: Victoria Girgis/Lowell Observatory
The first batch of ~60 Starlink satellites was a scrappy lot. Below is a plot from What are these four “debris” objects along with the Starlink satellites? about two weeks and then six weeks after launch, showing that they took substantially different paths to reach their ultimate target orbit.
Ignoring time zones, the photo was taken on 18-Nov-2019, a week after the 11-Nov-2019 launch. So in addition to whatever differences in their orbit accumulated due to initial order 0.1 to 1 m/s deployment differential, drag differences due to initial random attitudes and Earth's lumpy gravity field, each took it's own course once it stabilized in attitude and started climbing. So in any given snapshot during their individual journeys there should be no expectation for them to be in he same orbit.
I don't know if their destinations are all in a single orbital plane, but if so they will need to distribute themselves evenly by "phasing" which means some need to be a little higher and some a little lower in order to spread out along the track. Viewed from the side and not from underneath, different altitudes will appear as offsets in their paths, so this can be contributing as well.