Your examiners are allowed to have a different opinion to you.
They might favour a method, prefer an author or think that your results mean something other than your conclusion. They’re allowed to because they’re experienced: they view your work through the prism of their knowledge and talent.
That doesn’t mean they’re right. Depending on how they frame their questions and comments, you have to think and decide whether there is just your way of seeing things or if something is open to interpretation.
And if it is you have to share why you think your interpretation is the right one. Why are you convinced? What makes you sure? What could dissuade you? What possible criticisms could someone make? What might your examiners think?
Ask some of these questions before the viva and you’ll be better able to defend your research when you talk with your examiners. Why-How-What could be a useful framework to start your reflections.