[crote]

The ones really close together are freshly launched and still being moved into their final position.

However, all satellites are by design placed into a small number of orbits, see [0]. For example, phase 1 consisted of 72 different orbits with 22 sats each, so each sat would be 1/22th of an orbit behind the previous one - and the orbits are shifted in a similar fashion around the earth. This ensures that there is a uniform global coverage, as a new sat will move over an area right when another one moves out.

[0]: https://en.wikipedia.org/wiki/Starlink#/media/File:Starlink_...