This is Politics’ review queues order in the dropdown:
This is Science Fiction & Fantasy’s:
Why are they in a different order? Is this a bug?
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They are displayed in the order you unlock the queues. On regular sites you earn close/reopen voting privileges at 3,000 reputation, and that is when you gain access to those queues. You gain edit privileges at 2,000 reputation, and that gives you access to the Suggested Edits and Low Quality Posts queues.
Aside from reviewing suggested edits, the low quality posts queue is also made available. This queue contains posts which were deemed of low quality by the system. Users are charged with the task of editing to improve their formatting and content, recommending deletion if it doesn't belong on our site, or marking that it is an acceptable post.
However, on Beta sites (such as Politics) the privileges don't follow that exact order. You gain close/reopen voting privileges at 500 reputation, and edit privileges at 1,000 reputation.
Therefore, on Beta sites the review queue list has Suggested Edits and Low Quality Posts above Close and Reopen because you gain access to them later.