Problem 1: incorrect dead status
Diffs:
https://en.wikipedia.org/w/index.php?title=Shahid_Malik&diff=prev&oldid=769040691
https://en.wikipedia.org/w/index.php?title=Bollard&diff=prev&oldid=769040837
https://en.wikipedia.org/w/index.php?title=Royal_Malay_Regiment&diff=prev&oldid=769040796
IABot is commonly (though not always) marking this domain as dead when it's working. It's one of the Memento-based archive services, the National Archives of the UK.
Problem 2: {{dead link}} inserted into the middle of a URL
https://en.wikipedia.org/w/index.php?title=British_Society_for_Research_on_Ageing&diff=prev&oldid=769094563
https://en.wikipedia.org/w/index.php?title=Cleveland_Institution_of_Engineers&diff=prev&oldid=769094468
https://en.wikipedia.org/w/index.php?title=Block_Exemption_Regulation&diff=prev&oldid=769094259
https://en.wikipedia.org/w/index.php?title=Canonbie_Coalfield&diff=prev&oldid=769093762
Problem 3: archive-url is mangled
https://en.wikipedia.org/w/index.php?title=Gallon&type=revision&diff=768949485&oldid=768941110
In the second cite template the "archive-url" got mangled like this: http://webarchive.nationalarchives.gov.uk/20110207120946/https:///