I'm making changes to my Income Statement financial report, removed a row from the layout and now another row has disappeared. Does this happen to anyone?

yes, editing the FS layouts is time consuming. Keep previous copies as sometimes you need to rollback. Rows will disappear if it no longer has content. Can you determine into which section that account now appears? Sometimes I have to specific both the Account to NOT appear in this section as well as specifying where I want it to appear.