A malplaced disambiguation page is one that has no primary topic but is not at the base name, e.g., when Fizzboz redirects to Fizzboz (disambiguation). This situation is avoidable, as the disambiguation page can exist at Fizzboz, and the accepted standard is to place the disambiguation page at Fizzboz.
The policy regarding malplaced disambiguation pages is at Wikipedia:Disambiguation#Naming the disambiguation page: The title of a disambiguation page is the ambiguous term itself, provided there is no primary topic for that term. Guidance on the use of a redirect containing "(disambiguation)" is at Wikipedia:Disambiguation#How to link to a disambiguation page. See also {{R to disambiguation page}}, Category:Redirects to disambiguation pages.
Never carry out a cut & paste move. If there is a malplaced disambiguation page you can't move, simply list it below and an administrator will attend to it.