APA6th, The citation list is not formatted correctly when there are too mang citations.
When there are too many citations, the citation list is formatted incorrectly; when I delete half of the article and update the citation list, the formatting is correct again. Anomalies are suspected to be caused by too many citations.
If you don't get italics where you expect them, see https://www.zotero.org/support/kb/italics_in_word_bibliographies
Please try the above solutions given by adamsmith.