There’s always a chance you’ve missed something. Not a typo, not a passage that needs editing, but something wrong. Maybe something that is a problem.
It’s a very small chance though. Long odds.
There’s a greater chance that your examiners THINK there is something wrong, or that you’ve not acknowledged something they feel is really important. They might be right, but it’s not a good idea to just accept what they say, or for you to put your head down and insist that you are right.
Instead: ask them why. Why do they think you’ve made a mistake? What are their reasons? What’s their thinking? Because you know your thinking. Once you have both pictures, you can start to see what the reality might be. What sounds like a mountain-high hurdle could be a tiny speed bump. After thinking and talking it through, it may not even be a problem.
There’s a chance that you’re wrong, but given how far you’ve come, it’s much more likely that you’re right or know the way to right. Show your examiners.