I was reviewing some first posts, and I decided to fix a typo in one of them.
This post had one suggested edit in the queue, so editing it brought up the edit review page. The edit didn't fix the typo, so I went to improve it.
After I fixed the typo, I found myself at the next item of the suggested edits review queue, rather than back among the first posts.
I think that you ought to stay in the queue you were browsing in such a situation, and be able to complete your original review.