Delete page and the comments on the page remain in file on another page

I am using Acrobat X Pro for creating submittals and manuals. I have some PDF files that I have saved to use as templates, with comments (lines & arrows & text) on many of the pages. I move the lines and arrows around to point to whatever items are relevant for the specific manual I am creating. However, it's also necessary to frequently delete pages for items that are not included in the current piece of equipment the manual is for. However, when I delete a page with comments on it, those comments don't delete, but are put on an adjoining page and then I have to go delete them manually (if I am lucky enough to see that they are there). Why don't the comments get deleted with the page they are on?