WP ajax requests not stacking?

@Rup’s comment above led me to the answer; my wp-ajax request was functioning fine, but my incomplete understanding of jquery’s $(this) selector meant that I was targeting the last item clicked with the success response each time. This question can now be closed.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)