Issue with API ordering that results in winner_count/seats_contested not updating

[VirginiaDooley]

Ref https://app.asana.com/0/1204880927741389/1207254815979876/f

There is some kind of non-deterministic ordering bug going on here. If I call
https://elections.democracyclub.org.uk/api/elections.json?future=1&limit=100&offset=0 and
http://elections.democracyclub.org.uk/api/elections.json?future=1&limit=100&offset=100
those two pages of results shouldn't contain any duplicates, but local.north-northamptonshire.desborough.by.2024-04-04 sometimes appears in both pages (interestingly, if I call http://elections.democracyclub.org.uk/api/elections.json?future=1&limit=100&offset=100 a few times, sometimes that election is in it and sometimes it isn't) (edited)

Could this be some version of #2038 back again?

Possible solution: Add the election_id to the sort_by, following group_type