'All elections' list oddities

[pmk01]

Spotted on https://whocanivotefor.co.uk/elections/

Nov. 5 2010. Parliamentary by-election deleted, but still in list of all elections: https://whocanivotefor.co.uk/elections/parl.2010-11-05/uk-parliament-elections/ (gives a 500 error)

5 May 2016: South Bucks by-election featured twice. We need to remove "South Buckinghamshire by-election: Farnham Royal and Hedgerley ward" (it doesn't exist in EE and is a link to https://whocanivotefor.co.uk/elections/local.south-bucks.2016-05-05/)

16 Feb 2017: Cheshire East by-election deleted in EE but still exists: https://whocanivotefor.co.uk/elections/local.cheshire-east.2017-02-16/cheshire-east-local-election/

[pmk01]

Some EU elections are retuned when UK parliament is selected on the filter.
https://whocanivotefor.co.uk/elections/?election_type=parl

[pmk01]

5 May 2016: Police and Crime Commissioner Elections 2016 by-election

I can't seem to find this in EE at all, and it returns a 500 when selected.

[pmk01]

Manchester Gorton by-election shows twice. The top link goes straight to the ballot, while the second (correct) link goes here.