org-log-states-order-reversed

org-log-states-order-reversed is a variable defined in `org.el'.
Its value is

t

Documentation:
Non-nil means the latest state note will be directly after heading.
When nil, the state change notes will be ordered according to time.

This option can also be set with on a per-file-basis with

#+STARTUP: logstatesreversed
#+STARTUP: nologstatesreversed

You can customize this variable.