Unexpected page breaks in play script

I copy/pasted a script from Pages, then formatted it in US Stage Play. When I compiled it to PDF, there were several random, unexpected (and unwanted) page breaks in the middle of speeches, between sentences. I went back to Pages and turned on invisible characters, but there are no page breaks anywhere in the document. I returned to Scrivener and deleted the space and period between those sentences and typed them in afresh — same problem. There is no reason for Scrivener to be inserting page breaks at these random places (which were the same for every compile). What is the solution?