I think it's a bit extreme to say that the quotation marks are wrong. The convention of which quotation mark to use for a quote and a nested quote usually depends on what country the author or publisher is from. For example, British writers traditionally use single quotation marks for quotes and doubles for nested quotes, while US writers use the opposite style.
In my mind it's like declaring that the spelling of the word 'color' is wrong and that I must replace all instances of it in my American ebooks.
But go ahead and replace them if it bugs you.
I just want to make sure that you know that it's not a grammatical error and it's just a writing style you seem to be unaccustomed to. For myself growing up living in Ireland, half of the books on my shelves are American style and the other half British style and I really don't see the reason to declare one style to be more correct than the other.