Paragraphs missing when compiling to epub

Hi, I have an urgent issue. I’ve just sent out my ARC copies for my new release and realised that there are random paragraphs missing mid scene from the epub file. They’re there in Scrivener (V3 windows), but when I look at the compiled epub file they’re gone! And I can’t figure out why or how to fix it.
Has this happened to anyone else?

Are the paragraphs in separate documents in the Binder, or in the middle of documents that are otherwise correct?

Is the missing text styled differently from the not-missing text?

Is the text also missing if you compile to another format, such as RTF or PDF?