Thank you for posting the screenshots. They are very helpful.
The second screenshot clearly shows that the bookmark labels contain newline characters. Your bookmark labels span two lines.
line 1: 6.<newline>
line 2: . Horse Expo
line 1: 7.<newline>
line 2: . a. Second Read...
Acrobat Reader for iOS shows only the first line ("6", "7") of each bookmark label and does not show the second line. On the other hand, iBooks shows multi-line bookmark labels.
I will file a bug report for the problem with multi-line bookmark labels in Acrobat Reader.
As a workaround, if you have a copy of Acrobat Pro (a PDF editor for Windows or Mac computers), you can edit the bookmark labels to remove the newline characters and turn them into single-line bookmark labels.
You can also use a 30-day trial copy to see if it fits your needs.
Thank you for reporting the problem!
Thanks for the quick response. We got the clerk to update the bookmarks in the agenda.