Don’t worry. It means you have something interesting in your research. It means that in the viva your examiners have a lot to ask about.
And it means you’ve been working on your thesis for a long time. You will know how to engage with people who aren’t sure. With people who want to know more. With people who have their own ideas.
So read up, think, have a mock viva and conversations with friends, and get ready to explore your work.