Piano part messed up after working on full score

So, I worked on a simple full score, but now the piano part (only part) is messed up. Am I only supposed to work on layouts?

What does messed up mean here exactly?
This looks like it deserves its own new topic.

Welcome to the forum. You’ll need to provide a little more info. Can you attach a screenshot? (Maybe not yet, since you’re a new member)