The end of the milestone should be at the red arrow. The Bible Lesson and Hymn belong to the next set.
You are correct. The text between the end of question 32 and the beginning of Question 33 (i.e. "13. Sunday ... Lord divine.") does not belong to Question 32 and should be fixed.
Question: rather than close the milestone at the would it not make more sense to begin the milestone (e.g. Question 33) at the beginning of the article (i.e. just prior to "13. Sunday")? Strictly speaking the Bible verses are not part of the Heidelberg Catechism itself but a commentary of sorts upon the question. One could argue that the Bible Lesson Passage and the Hymn also act as a commentary of sorts and could benefit from belonging to the milestone.
Yes, I would change where the milestone begins.
I agree. An updated resource will be pushed out on January 25.